Big Problem - 3000GT/Stealth International Message Center

jj2314 · 04-13-2008, 07:13 PM

So i finally get everything put into my car and take it for a test drive

I recently put a new IAC/ISC and new fuel filter in my 3000gt hoping it would fix my idle.

Well as im driving down my road i go to stop and push in my clutch and sure enough my car loses all RPMs and dies so i turn it back on but have to give it gas so it wont die and turn around and drve back home.When i get home i stop and turn the car off and my engine is smoking.

I let it sit for a while and went to turn it back on and struggled for a few seconds turned on but immediatly lost RPMs and turned off

I now went to try again and it wont turn over at all anymore.

Does anyone know whats going on

Konfyoused · 04-13-2008, 07:14 PM

sounds like a MAS going bad to me.

Alex3000GT · 04-13-2008, 07:24 PM

Does your exhaust smell like unburnt fuel?

If so, check out your plugs and wires, when was the last time they were both replaced? If you don't know the answer, change them.

Also check for vacuum leaks with soapy water at every fitting along your intake system, preferably while your engine is still cold so you wont burn yourself when you rest your hand on valve cover..

Does the car sound really rough? Almost diesel-like. If so, I'd lean towards a bad MAF sensor or maybe just an unplugged MAF sensor.

How long ago did this problem arise? Was it gradual or suddenly? Is your check engine light on? What year is your car? (OBD1 testers are cheap and can pull engine codes).

jj2314 · 04-13-2008, 07:56 PM

ok to add some more info the car is a 91 3000gt base

the car has been having the idle problem and thats why i replaced the ISC/IAC and thought that that would solve it.I just replaced the plugs.

The car didnt seem rough but an example would be a would rev the car to say 4k to 5k RPMS and let off the gas in neutral sitting still and the RPMS would dip way down to say 100 to 200 and almost die and then shoot back up.

I cant check the gas because the car will not turn on anymore

Hope this helps

ooeygooey · 04-13-2008, 10:41 PM

It would still run if it had a bad MAF sensor.. so i dont think thats your problem

so your saying that the rpms are jumping up and down?

could be your TPS sensor, i turned mine all the way clockwise and it fixed the erratic idle and bucking in 1st gear.

jj2314 · 04-14-2008, 07:33 PM

yes the rpms will be fine until i approach a stop or slow to turn and then the rpms will drop all the way down and the car will either almost turn off or turn off to where i have to stop and turn the car back on.

just tryin to figure out whats going on so i can actually drive the car without it dying on me every stop

oh also the car is firing up and running again idk what happened yesterday.

ooeygooey · 04-14-2008, 08:16 PM

Quote:

Originally Posted by jj2314

yes the rpms will be fine until i approach a stop or slow to turn and then the rpms will drop all the way down and the car will either almost turn off or turn off to where i have to stop and turn the car back on.

just tryin to figure out whats going on so i can actually drive the car without it dying on me every stop

oh also the car is firing up and running again idk what happened yesterday.

check your TPS sensor man theres actually a "How-to" on it and ways to check its good and make sure that its set-up properly

jj2314 · 04-14-2008, 08:35 PM

ok i will as soon as possible and get back to you with the results

thanks for helping me narrow down the problem

ooeygooey · 04-16-2008, 09:56 PM

Quote:

Originally Posted by jj2314

ok i will as soon as possible and get back to you with the results

thanks for helping me narrow down the problem

any luck yet bro?

jj2314 · 06-02-2008, 04:08 PM

well i just got back the car from paint.It took a while but im back on the hunt to fix this problem so as of now not any luck yet

Im still working on fixing the tps

04-13-2008, 07:13 PM	#1 (permalink)
jj2314 Forum Member Join Date: Jan 2008 Trader Rating: (0)	Big Problem So i finally get everything put into my car and take it for a test drive I recently put a new IAC/ISC and new fuel filter in my 3000gt hoping it would fix my idle. Well as im driving down my road i go to stop and push in my clutch and sure enough my car loses all RPMs and dies so i turn it back on but have to give it gas so it wont die and turn around and drve back home.When i get home i stop and turn the car off and my engine is smoking. I let it sit for a while and went to turn it back on and struggled for a few seconds turned on but immediatly lost RPMs and turned off I now went to try again and it wont turn over at all anymore. Does anyone know whats going on

04-13-2008, 07:14 PM	#2 (permalink)
Konfyoused SOHC Abuser Join Date: Jul 2007 Location: Winder, Ga Drives: 1991 Stealth base Trader Rating: (1)	Re: Big Problem sounds like a MAS going bad to me. __________________ I really need to put something here, don't I??

04-13-2008, 07:24 PM	#3 (permalink)
Alex3000GT Engineering Student Join Date: Aug 2005 Location: Wheatfield, Indiana Drives: 92 3000gt base Trader Rating: (12)	Re: Big Problem Does your exhaust smell like unburnt fuel? If so, check out your plugs and wires, when was the last time they were both replaced? If you don't know the answer, change them. Also check for vacuum leaks with soapy water at every fitting along your intake system, preferably while your engine is still cold so you wont burn yourself when you rest your hand on valve cover.. Does the car sound really rough? Almost diesel-like. If so, I'd lean towards a bad MAF sensor or maybe just an unplugged MAF sensor. How long ago did this problem arise? Was it gradual or suddenly? Is your check engine light on? What year is your car? (OBD1 testers are cheap and can pull engine codes). __________________ NG06 - DOHC NA - ATX --- 16.6 --- 85 MPH NG07 - DOHC NA - MTX --- 15.7 --- 89 MPH 7.78 sec 0-60 3,044 lbs w/out driver 1992 3000GT 1991 Stealth

04-13-2008, 07:56 PM	#4 (permalink)
jj2314 Forum Member Join Date: Jan 2008 Trader Rating: (0)	Re: Big Problem ok to add some more info the car is a 91 3000gt base the car has been having the idle problem and thats why i replaced the ISC/IAC and thought that that would solve it.I just replaced the plugs. The car didnt seem rough but an example would be a would rev the car to say 4k to 5k RPMS and let off the gas in neutral sitting still and the RPMS would dip way down to say 100 to 200 and almost die and then shoot back up. I cant check the gas because the car will not turn on anymore Hope this helps

04-13-2008, 10:41 PM	#5 (permalink)
ooeygooey Forum Member Join Date: Aug 2007 Location: Sugar Grove,Illinois Trader Rating: (0)	Re: Big Problem It would still run if it had a bad MAF sensor.. so i dont think thats your problem so your saying that the rpms are jumping up and down? could be your TPS sensor, i turned mine all the way clockwise and it fixed the erratic idle and bucking in 1st gear.

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04-14-2008, 07:33 PM	#6 (permalink)
jj2314 Forum Member Join Date: Jan 2008 Trader Rating: (0)	Re: Big Problem yes the rpms will be fine until i approach a stop or slow to turn and then the rpms will drop all the way down and the car will either almost turn off or turn off to where i have to stop and turn the car back on. just tryin to figure out whats going on so i can actually drive the car without it dying on me every stop oh also the car is firing up and running again idk what happened yesterday.

04-14-2008, 08:35 PM	#8 (permalink)
jj2314 Forum Member Join Date: Jan 2008 Trader Rating: (0)	Re: Big Problem ok i will as soon as possible and get back to you with the results thanks for helping me narrow down the problem

06-02-2008, 04:08 PM	#10 (permalink)
jj2314 Forum Member Join Date: Jan 2008 Trader Rating: (0)	Re: Big Problem well i just got back the car from paint.It took a while but im back on the hunt to fix this problem so as of now not any luck yet Im still working on fixing the tps