Topic: Help 20v overfueling and rev dropping

Hi guys please can someone help.Ive got a 2001 rxi 6spd.The car floods and overfuels when you rev a couple of times before you take off or on idle,You can smell the fuel and fumes and smokes when you take off ../../extensions/custom_smilies_2/img1/sad.Secondly when you brake the car almost dies and drops around 500rpm.:o and comes back around 900 after 3 - 4 seconds.

Ive put a brand new oxygen sensor from agents.Ive ran a diagnosis e1 te1 and absolutely no codes come up.Ive changed the fuel pressure regulator,thermostat,tps sensor,water temp sensor,Checked for all pipes with leaks,changed from caltex ,sasol, shell, now back to caltex.I do a lot of milage and this is really anoying, roughly 5000 - 7000 kms a month.The car is currenly on 263000kms on the clock. Any ideas anyone have a similar problem. Please help thanks guys

Much App:D

Re: Help 20v overfueling and rev dropping

anyone set on ur TPS?
or maybe
blocked fuel filter. start there take it off and blow our petrol then try blowing though it compare to new one before buying one.

7AGE 6SPD: 2B1 Built & Mapped by Autotrix   "Best 1/4mile time 14.2sec @ Mtuba (MSA EVENT) "
Don't INJURE what you can't KILL!!!                           
Update : 5 May 2013 14.2@161kmph (achieved time with car having a miss fire issue)
http://i632.photobucket.com/albums/uu42/20plenty/7age_2_zps44a6e6ab.jpg
What did the 1 V-tec supporter say to the other V-tec supporter?
NB:Remember!!!
If the 20vs 1st off the line we'll say he JUMPED THE V-TEC!
but if the VTEC's 1st off the line we'll say he OUT LAUNCHED THE 20V!
sweeeeeet!!! we cant lose this way.......(^_^)

Re: Help 20v overfueling and rev dropping

../../extensions/custom_smilies_2/img1/sad new filter on the car did 6000km with it

Re: Help 20v overfueling and rev dropping

hey dogla

did u manage to find the fault ?

current :
2005 Golf 5
1995 MK3 Supra 3.0 Turbo
1998 RSI 20v - aspirated 105kw atw :-0

Ex
1992 GLI Twincam 16 - 375HP at ODR
1994 160i - Jade Green

Re: Help 20v overfueling and rev dropping

@Dogla...did you clean out the throttle and idel sensor?

The best thing about music is, when it "HITS" you....you feel no pain!
99' conquest - 4agze 73kw@wheels no spice, add spice 158KW@wheels!
IS250 F sport
00' RXI(ex)
03' Run X RSI(ex)
93' Gli(ex)
98' Vtec(ex)

Re: Help 20v overfueling and rev dropping

Hi guys i got the same problem it started about a week ago any tips on what should be done?

Mod edit...

[img]'http://i773.photobucket.com/albums/yy13/4AGE-ZN/17052009242-2-3.jpg[/img]

Resize to so it is widder... and not so long

Re: Help 20v overfueling and rev dropping

Where are the so called gurus??? of this website??? I tought these were toyfans and supposed to help 1 another.Only a couple of guys replied to my post (thanks guys) Well my story is a long one.

My 2001 rxi 6spd
Had an idle problem (spluttering/overfueling/blacksmoke/when braking or stopping car almost dies/or idles high 1.5-2k)
Well not many people helped me here. But ill tell you what i tried it most probably will save you alot of money.People are famous for telling you change this sensor change that sensor.Well you will end of wasting your money in the end.

1.This is what i tried (the famous oxygen sensor brand spanking new) reset ecu blah blah blah help abit with spluttering
2.Brand new themostat (no difference-flushed put coolent blah blah)
3.idle speed control valve (cleaned original 1 no difference/bought a new 1 no diference )
4.throttle position sensor (tps- changed adjusted blah blah no diference)
5.Complete throttle body with all sensors and inlet manifold changed (nothing no diference)
6.brand new vvt gear (does not apply to problem but also been changed)
7.water/coolent sensors changed (no diferrence) ../../extensions/custom_smilies_2/img1/sick  ../../extensions/custom_smilies_2/img1/sick  ../../extensions/custom_smilies_2/img1/sick  ../../extensions/custom_smilies_2/img1/sick  ../../extensions/custom_smilies_2/img1/sick

In other words ive changed every sensor on that car.Never came right.only thing left was a ecu and fuel pump.
I was comming from stanger to durbz and i ran a bearing on the car (6 valves bent /crank stuffed c/am stuffed/no3 conrod bent etc.Beeg damage. ../../extensions/custom_smilies_2/img1/sick  ../../extensions/custom_smilies_2/img1/sick Any ways i sold that car a month or 2 ago got another x

But my bro bought a 98 5spd twintig

Exactly the same problem.only difference.He ran a bearing .he did the complete motor.And the problem still there.We changed all the sensors exactly like my rxi.No diference. Im lost .last time i had a idle problem took my car to ***SAMTECH** IN PHOENIX that the BIGGEST chooor he charged me R950 for fokkol.never fixed the problem.he is the last person on earth id recomend he is a total idiot (Which thick headed person blocks an idle speed control valve) .

Well just my 2c. just givin you guys advice.Firstly dont take your cars to idiots like samtech.(beeeg choooor)Dont waste you money on sensors.Try another sensor before buying one.Well not sure if anyone had a bad run like me, but i hope this helps ( ill even help you okes if anyone has an idle problem come check me out i have a full packet of 20 valve sensors) You can try it on your cars to see if it will make a difference No Charge free (but buy me one bottle jack)  ../../extensions/custom_smilies_2/img1/biggrin2  ../../extensions/custom_smilies_2/img1/biggrin2  ../../extensions/custom_smilies_2/img1/biggrin2  ../../extensions/custom_smilies_2/img1/biggrin2  Ph me 0849800116

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

To all: finding a problem over the phone/internet without seeing the car is a very tricky situation, eg we can give you all the possible problems but lets say there is a whistling noise "vacum leak" and the owner of the car doesnt know that that noise is not suppose to be there he will then go arround cheching everything else but instead its just a small hole in one of the hoses..... he checks clamps,sensors,etc but because he is not aware that that noise is the fault he overlooks it. this is just one example so by not being able to see the car personaly  and only going on the owners "problem description" it becomes more of a guessing game as we dont know the owners knowlegde of engines so we take it he has enough knowledge as he is willing to do the "modds/fixing" himself.   ../../extensions/custom_smilies_2/img1/wink

PS: never overlook the obvious,  ../../extensions/custom_smilies_2/img1/wink

Last edited by Silent Knight (2009-11-18 09:19:19)

7AGE 6SPD: 2B1 Built & Mapped by Autotrix   "Best 1/4mile time 14.2sec @ Mtuba (MSA EVENT) "
Don't INJURE what you can't KILL!!!                           
Update : 5 May 2013 14.2@161kmph (achieved time with car having a miss fire issue)
http://i632.photobucket.com/albums/uu42/20plenty/7age_2_zps44a6e6ab.jpg
What did the 1 V-tec supporter say to the other V-tec supporter?
NB:Remember!!!
If the 20vs 1st off the line we'll say he JUMPED THE V-TEC!
but if the VTEC's 1st off the line we'll say he OUT LAUNCHED THE 20V!
sweeeeeet!!! we cant lose this way.......(^_^)

Re: Help 20v overfueling and rev dropping

Fully agreed Jason. Also note that every engine has different tolerances depending on the state of tune, mileage, components (genuine or pirate etc) , and while we try and much as possible to assist in resolving problems.......it may still at the end of the day come down to narrowing down the possibilities.

In your case, as in was the case with Kamz as well, it could be any number of infinite possibilities relating to the problem. No concrete solution can be made online without seeing or hearing the car. What we can do is advise on the best course of action based on past experience. Eventually we found the problem on Kamz 20v and it was related to the knock sensor. Similarly in your case further investigating into the problem could have yielded the solution....

Had you possibly consided asking us who you could have taken the car to in Durban? We would have then sent you to probably the most qualified Mac on 4AGE's around to analyse....and it would have not even cost you a penny.

I feel that your personal slander towards 9000RPM is not warranted.....especially when there are guys here that offered advise and were prepared to help.

Corolla RXi 20v Blacktop                    87 RSi 4AGE 16v "DBN Stock"- 282Wkw @ 1.8 bar
TRD 0.8mm Head Gasket                   Turbonetics 0.63 A/R T3/T4 turbocharger
Yoshimura 270 cams                         Turbonetics Evolution Wastegate
TODA valve Springs                          Built ZE 8.9 bottom end, ARP, FMIC
63mm Exhaust                                 Boost Cooler, Full Management

PM me for all 9000RPM Stickers, T-shirts,Caps
Legends Never Die....They are just Reborn with BooSt
                                   http://img.photobucket.com/albums/v187/twincamsam/10a4_3_resize_resize_resize.jpg
http://img.photobucket.com/albums/v187/twincamsam/3supras.jpg

Re: Help 20v overfueling and rev dropping

Hi Mate

Sorry to hear about the problem with your 20v. I am not sure if you got sorted. All I would like to add is that I have been in the same situation for about 6 months and nobody was able to help me sort the same problem.

After my cambelt snapped, I had the head re-done(bent 10 valves). Got it back, very exited. Put it back together only to find my worst nightmare came tru. Overfeulling, rev dropping, pinging uneven idling and a whole lot more. So much that I could not trust my car to go to the shop just down the road.

Spoke to many  mechanics. Obvious everybody you speak to is a twincam wizard and had various cars and done numerous upgrades and changes. Changed all sensors, had the ecu checked out and so on and so forth.

Eventually a friend of mine who specialises in motorbikes told me that if the valves don't seal properly the engine the engine will struggle to idle at low revs. The called for me to check valve clearances to start with. They were all WRONG. Some had no clearance and some were way to big. After sorting that out the car were a whole lot better but still not the way it as before the rebuilt.

After a while I took the head off and reverted to the old testing teqniques of testing valves. As I poured parrafin in on the head it came pissing out the bottom. Finnaly after about 4 days of trying to sort out valves and get them to seal properly , I decided it was time to get a specialist in. They spent 5 minutes lookig at the head and suggested I use it for scrap metal as the rebuilders completely F****ed it up. The valves were not seating propely, valve seats were cut too deep, head was skimmed to far and the list goes on and on. The rebuilders which was recommended by Toyota actually specializes in rebuiliding tracktor engines!! They even admitted that Toyota themselves have to remove heads more then once to get it right. I was in total shock!!!

Bought another recon head from headsone. Which was in a much better condition than mine. Even had the original valves in. Did the fitting in an afternoon. Turned the key and she purred like a kitten.

My advice. Check the basic mechanics of the engine before changing stuff that were working fine before.

Hope this helps!

Re: Help 20v overfueling and rev dropping

For those that were or got offended sorry guyz/galz.My point was i posted this problem months ago only 2 - 3 members replied. (where is the so called help there) taught we supposed to help 1 another.but sorry if i offended any1.

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

Any ways back to my broz problem. Like i said ecu and fuel pump only thing left. We shake his car up and down near the tank. the car starts instantly on the turn (normally you have to press throttle).Car idle hundreds 1.5 when cold and around 900 when warm. But problem comes back after 20 - 30 mins.So im pulling of his back seat maybee the harness on his fuel pump is messing around,worth a try. And i did check valve clearance all hundreds hardly skimmed head very light. But either way my broz problem was there before we did the engine. any1 have a spare 5spd 20 ecu to lend or try id be gratefull.  ../../extensions/custom_smilies_2/img1/biggrin2  ../../extensions/custom_smilies_2/img1/biggrin2  ../../extensions/custom_smilies_2/img1/biggrin2  ill swop my packet of sensors  ../../extensions/custom_smilies_2/img1/laughing  ../../extensions/custom_smilies_2/img1/laughing  ../../extensions/custom_smilies_2/img1/laughing  shot

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

Who do you guys deal with Donny Christy? i know them all ?? anyone else in durbz?

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

No problem asking for help . The problem with most guys is they take you car in charge you to diagnose dont even fix fault or find fault and hit you with a heavy bill. I find alot of info on this forum helped me tonz of times just tawt someone had a similar issue.If one of the admins would really recommend an excellent mach and someone relating to ecu electrical faults id be gratefull. The problem is who do you trust. Alot of ripp offs out there. Next option im taking the car to nizaam in phoenix anyone think its a good bad idea please advice thanks.   ../../extensions/custom_smilies_2/img1/wink  ../../extensions/custom_smilies_2/img1/wink

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

TwincamSam wrote:

Fully agreed Jason. Also note that every engine has different tolerances depending on the state of tune, mileage, components (genuine or pirate etc) , and while we try and much as possible to assist in resolving problems.......it may still at the end of the day come down to narrowing down the possibilities.

In your case, as in was the case with Kamz as well, it could be any number of infinite possibilities relating to the problem. No concrete solution can be made online without seeing or hearing the car. What we can do is advise on the best course of action based on past experience. Eventually we found the problem on Kamz 20v and it was related to the knock sensor. Similarly in your case further investigating into the problem could have yielded the solution....

Had you possibly consided asking us who you could have taken the car to in Durban? We would have then sent you to probably the most qualified Mac on 4AGE's around to analyse....and it would have not even cost you a penny.

I feel that your personal slander towards 9000RPM is not warranted.....especially when there are guys here that offered advise and were prepared to help.


Hi bro plez advice on some good mac's in durban 4 a 20v.

Mod edit...

[img]'http://i773.photobucket.com/albums/yy13/4AGE-ZN/17052009242-2-3.jpg[/img]

Resize to so it is widder... and not so long

Re: Help 20v overfueling and rev dropping

PM sent  ../../extensions/custom_smilies_2/img1/wink

Corolla RXi 20v Blacktop                    87 RSi 4AGE 16v "DBN Stock"- 282Wkw @ 1.8 bar
TRD 0.8mm Head Gasket                   Turbonetics 0.63 A/R T3/T4 turbocharger
Yoshimura 270 cams                         Turbonetics Evolution Wastegate
TODA valve Springs                          Built ZE 8.9 bottom end, ARP, FMIC
63mm Exhaust                                 Boost Cooler, Full Management

PM me for all 9000RPM Stickers, T-shirts,Caps
Legends Never Die....They are just Reborn with BooSt
                                   http://img.photobucket.com/albums/v187/twincamsam/10a4_3_resize_resize_resize.jpg
http://img.photobucket.com/albums/v187/twincamsam/3supras.jpg

Re: Help 20v overfueling and rev dropping

TwincamSam wrote:

PM sent  ../../extensions/custom_smilies_2/img1/wink

thanks Sam.

Mod edit...

[img]'http://i773.photobucket.com/albums/yy13/4AGE-ZN/17052009242-2-3.jpg[/img]

Resize to so it is widder... and not so long

Re: Help 20v overfueling and rev dropping

Eish, sorry guys been busy with audit at work - hence late reply.

As TCSam pointed out, I had the same idle problem after overhauling my motor. We tried everything, to cut a long story short- it was the knock sensor that was stuffed!

As the gurus mentioned - You can call the doctor and tell him you have a chest pain. Many things can cause a chest pain. No way in hell you going to get the right diagnosis/repair over the phone guys. We are here just to advise, if we had the car in front of us we can give more input.

Back to the idle problems -
1. Check knock sensor - change and drive the car for approximately 20kms after resetting the ECU. The ECU takes time to pick up signals and calibrate settings so thats why I say drive for 20kms, stop and start - not freeway.
2. Get hold of all vaccuum pipe diagrams to check if the machi fitted everything correctly. Reset ECU and drive the car and guage improvement.

Once you have done the above two, please come back to us and let us know.

I know that it gets a bit frustrating, especially after spending big $$$ and still have problems - trust me I lost count after spending in excess of 35k  ../../extensions/custom_smilies_2/img1/tongue

Current: '00 Rxi BlackTop http://i285.photobucket.com/albums/ll70/KAMZ20v/burnrubber.gif

http://i285.photobucket.com/albums/ll70/KAMZ20v/69d97f9e-a3eb-4840-87cc-0e10cb2754d7.jpg

Re: Help 20v overfueling and rev dropping

I had a customer who had a similar problem  it was his idle speed control valve. it is extremely difficult 2 diagnos sum1's problem over the internet without looking at the car especially a idle problem cud b many things that cud cause this

Re: Help 20v overfueling and rev dropping

DUPLICATE pls delete post

Last edited by RXi_2boost (2015-05-16 15:22:50)

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

Guys this post is over 6 years. Please dont call me 12 at night lol ../../extensions/custom_smilies_2/img1/laughing . For the record, problem was the valve clearance. I had lots of these 20 valve and runx rsi. They are were fun for me while i had them. Some might agree some might disagree with me. Toyo sux in this country, they never brought any proper liners after the x. Where the F is the boost lol. Thats why ive moved onto bigger displacements and boost. I repairs these little toyz. Anyone need help. Ill gladly help. I have an RMI Approved Repair Center in Durban North. Give us a Visit www.vicksautoclinic.co.za. We also do modz and servicing  ../../extensions/custom_smilies_2/img1/wink ,Thanks guys. BTW I GAVE THE PACKET OF SENSORS AWAY FOR DONATION LOL.

Now Boostin On Da Wheelz

Re: Help 20v overfueling and rev dropping

RXi_2boost wrote:

Guys this post is over 6 years. Please dont call me 12 at night lol ../../extensions/custom_smilies_2/img1/laughing . For the record, problem was the valve clearance. I had lots of these 20 valve and runx rsi. They are were fun for me while i had them. Some might agree some might disagree with me. Toyo sux in this country, they never brought any proper liners after the x. Where the F is the boost lol. Thats why ive moved onto bigger displacements and boost. I repairs these little toyz. Anyone need help. Ill gladly help. I have an RMI Approved Repair Center in Durban North. Give us a Visit www.vicksautoclinic.co.za. We also do modz and servicing  ../../extensions/custom_smilies_2/img1/wink ,Thanks guys. BTW I GAVE THE PACKET OF SENSORS AWAY FOR DONATION LOL.

Ell man i was going to call you for the packet of sensors  ../../extensions/custom_smilies_2/img1/laughing  ../../extensions/custom_smilies_2/img1/biggrin2

88 Toyota Avante
06' RunX RSI