hesitation

gomezmk · 01-02-2008, 03:59 PM

I have a 88 supra turbo,5-speed. Lately about every other drive cycle, intermintantly while I'm driving, the car will start to hesitate really bad and the engine will not respond to my gas petal for about three seconds, than it will respond. A check engine light comes on then goes away a few seconds later. I pulled over and did not shut the key off so I wouldn't lose the code and I did a diagnostics and no codes were found. It sounds like it might be a afm or tps. I'm not sure yet I need to do some resistance checks.

Chambers · 01-02-2008, 05:13 PM

How is the oil pressure when it doesn't respond? Does the turbo have any play? Other than those I would think it would be electrical. Good luck!

gomezmk · 01-02-2008, 06:39 PM

Oil pressure is ok, turbo has minimal play. The engine run great, turbo boost is working good, it's just every now and then it acts up, I just don't see how a check engine light comes on and I don't shut off the key and still theres no code when I do a diagnostics.

781supraturbo · 01-02-2008, 10:33 PM

sounds electrical

Supra2NR · 01-02-2008, 11:53 PM

i had the same problem b4
it only comes one when i run the car hard on the highway
and its goe away when i run the car harder,
i tried to save the code so many times but i jus couldnt get a reading
so i jus replaced my o2 sensor and it worked fine for me

Pretaco · 01-03-2008, 07:40 PM

O2 sensor problems will ususally happen constant at high speed/ high load conditions.
Intermittent hesitation could be the afm, or the tps, but should have a code pop up with te and e1 shorted. Could also be fuel pressure problem. Resistance checks might show all good unless you can test it when it is hesitating, which would be difficult at best.

gomezmk · 01-04-2008, 12:15 AM

Since its a intermittant problem, I would like to believe it something electrical. I removed the afm sensor from it's housing and noticed the sensing pole was covered in crap. I do have a K and N cone filter which I think is doing the damage since I have recharged it and probably over oilled the filter. I did resistance checks on the meter and found one measurement that was way off from spec and it was not the air temp sensing part. I'm going to shotgun it with the afm.

01-02-2008, 03:59 PM	#1
gomezmk 3" Exhaust Join Date: Jul 2006 Location: Santa Rosa, CA Posts: 70	hesitation I have a 88 supra turbo,5-speed. Lately about every other drive cycle, intermintantly while I'm driving, the car will start to hesitate really bad and the engine will not respond to my gas petal for about three seconds, than it will respond. A check engine light comes on then goes away a few seconds later. I pulled over and did not shut the key off so I wouldn't lose the code and I did a diagnostics and no codes were found. It sounds like it might be a afm or tps. I'm not sure yet I need to do some resistance checks.

01-02-2008, 05:13 PM	#2
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	How is the oil pressure when it doesn't respond? Does the turbo have any play? Other than those I would think it would be electrical. Good luck! __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

01-02-2008, 11:53 PM	#5
Supra2NR 1000whp postwhore Join Date: Apr 2006 Location: Chi-Town Posts: 1,643	i had the same problem b4 it only comes one when i run the car hard on the highway and its goe away when i run the car harder, i tried to save the code so many times but i jus couldnt get a reading so i jus replaced my o2 sensor and it worked fine for me __________________ http://www.myspace.com/supra_2nr Into Bikes now,, apparently the supra couldnt kill me, so my zx6 might lol

01-03-2008, 07:40 PM	#6
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	O2 sensor problems will ususally happen constant at high speed/ high load conditions. Intermittent hesitation could be the afm, or the tps, but should have a code pop up with te and e1 shorted. Could also be fuel pressure problem. Resistance checks might show all good unless you can test it when it is hesitating, which would be difficult at best. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

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01-02-2008, 06:39 PM	#3
gomezmk 3" Exhaust Join Date: Jul 2006 Location: Santa Rosa, CA Posts: 70	Oil pressure is ok, turbo has minimal play. The engine run great, turbo boost is working good, it's just every now and then it acts up, I just don't see how a check engine light comes on and I don't shut off the key and still theres no code when I do a diagnostics.

01-02-2008, 10:33 PM	#4
781supraturbo Intake Join Date: Dec 2007 Location: lynn Posts: 37	sounds electrical

01-04-2008, 12:15 AM	#7
gomezmk 3" Exhaust Join Date: Jul 2006 Location: Santa Rosa, CA Posts: 70	Since its a intermittant problem, I would like to believe it something electrical. I removed the afm sensor from it's housing and noticed the sensing pole was covered in crap. I do have a K and N cone filter which I think is doing the damage since I have recharged it and probably over oilled the filter. I did resistance checks on the meter and found one measurement that was way off from spec and it was not the air temp sensing part. I'm going to shotgun it with the afm.