no idle

[CruisinGA]

As of last night my '93 FZJ80 will not idle. This began randomly during my drive back to school last night.

I've done quick visual check, could not see any obvious problems.

I'm suspecting either a large vacuum leak or perhaps the TPS.

As far as I can tell it runs normally otherwise (ie any throttle input).

It won't start without my foot in the pedal either.

This occurred on my way back to school, and as I have limited time and tools here I was hoping people would have some suggestions for other places to start.

Thanks.

 

[CJF]

Usual suspect is a cracked air intake tube.

 

[landtank]

first thing to come to mind is the MAF sensor. I had this after some servicing where I didn't get it plugged in correctly. This did throw a CEL however.

Also fuel relay

 

[sseaman]

there seems to be a rash of these lately, check the intake, check all vaccum lines especially around the intake hose, if that all checks out then take an ohm meter and check the tps and idle air valve these are listed in the repair manuals, for a quick fix run your a/c this will cause the engine to rev higher. good luck let us know how it works out

 

[FloridaFJ80]

My engine started to idle really slow,(300 rpms) and will eventually just shut off. I unplugged and plugged my MAF and nothing. Took it out and cleaned it some, and nothing, no idle, well eventually after an hour of fooling around with it, it started to idle again and eventually rpms reached normal rpms. I am thinking my MAF maybe giving out, any ideas on what I should do to prevent this from happening again? Or where i can purchase rebuilt MAF's since i am sure these are expensive.

 

[nikos]

My engine started to idle really slow,(300 rpms) and will eventually just shut off. I unplugged and plugged my MAF and nothing. Took it out and cleaned it some, and nothing, no idle, well eventually after an hour of fooling around with it, it started to idle again and eventually rpms reached normal rpms. I am thinking my MAF maybe giving out, any ideas on what I should do to prevent this from happening again? Or where i can purchase rebuilt MAF's since i am sure these are expensive.

Try at
www.cruiserparts.net

I bought few Maf sensors for spare from them and they are really good ........

If the flap in you maf is moving freely i would search for an Air leak........
Check vacuum hoses and valve cover hose (at the rear of engine)

 

[FloridaFJ80]

Sweet thanks I will shoot them an email.!! and Also I will look around for any air leaks.

 

[DuManchu]

What about your IAC (Idle Air Control) valve? I know that was a source of idle problems on my 93 Mustang.

 

[CruisinGA]

I'm 95% sure that the IAC is the problem in my case.

One diagnostic- if turning on the A/C does not affect your low idle, then something in the IAC circuit is suspect, because that valve is responsible for controlling the fast idle as well as normal idle.

I've been too busy with school to fool with it, so I just tightened my throttle cable enough for a nice 600 rpm idle and have been runnin with that for a few weeks...