having wierd iddle problems.

APACHE 64D · Post by **APACHE 64D** » Sun Apr 20, 2008 11:37 pm

i posted a few days ago that my indy was iddleing at 3,000n rather than the normal 1,000 it usually has bfore. This morning when i tried to crack it up the car starter making some weird noises. It sounded like the starter was missing or something. I jumped the started and had to give it all the gas in order for it to catch up and get going. I'm not sure exactly what it was wrong but now the car runs ok. How can i find out if my started is going bad or if i have any relays, sensors, or anything else that might be causing these problems. The car now seems to be iddleing at 3,000 and drops to 2,800 and then back up to 3,000. Any input will be greatly appreciated. Thanks guys.

SuzukiGhostRider · Post by **SuzukiGhostRider** » Sun Apr 20, 2008 11:47 pm

Have you checked your TPS or IAC out? Could be the culprit....

Beretta__z26 · Post by **Beretta__z26** » Mon Apr 21, 2008 12:06 am

so what is the IAC? because this sounds like what my Z is kinda doing.

SuzukiGhostRider · Post by **SuzukiGhostRider** » Mon Apr 21, 2008 1:00 am

Idle Air Control ^^
Look at this article for a more in depth description.

Beretta__z26 · Post by **Beretta__z26** » Mon Apr 21, 2008 3:23 am

awesome. thanks!

APACHE 64D · Post by **APACHE 64D** » Mon Apr 21, 2008 4:45 pm

well, once again i tried to crank up the indy and this time the weird noise seems to be going away. However in order for the car to start i have to either hold the ignition down while crancking it or floored the gas. I'm getting fuel so i know that's not the problem so it has to do with a valve or something to operating right that cuts out my fuel bfore it can start. How i check to see if the iddle air control is what's causing my problem? thanks

SuzukiGhostRider · Post by **SuzukiGhostRider** » Tue Apr 22, 2008 1:15 am

Ok, I'm gonna take a stab at this. Judging from your exhaust problem in the other post and the hard starting you just described along with the high idle, I'm going to guess you have a fuel injector problem. I would recommend testing them with an ohm meter. Your IAC may be at fault too. This is probably going to be a fuel pressure/lack of fuel issue. I would say the high idle after start up is your TPS being faulty. Check it out first. GL.

JeffD · Post by **JeffD** » Tue Apr 22, 2008 11:58 pm

the weird starting noise was probably caused by your hydraulic lifters leaking down, preventing the valves from opening all the way and now the noise is gone because they pumped back up.
as far as the TPS sensor, if it were bad the computer would substitute the MAP and MAF signals to estimate throttle position. and as I have said before, the TPS sensor zeros itself of startup. if the signal were shorted to the 5 volt reference it would think that 5 volts = 0% throttle. so it can't be a TPS.
your fuel injectors probably leaked in the past 20 days, giving you a rich start, you would need as much air as possible to ignite that fuel. so it makes sense that you had to hold it wide open to start.

I dunno SGR, if it were a low fuel pressure problem it would Idle Higher than normal, but in the old post Apache said that it was driveable, and a low Fuel pressure symptom is that it'll run but one you put a load on it, it'll stall or have very little power.
I think that the IAC could be at fault too though, just take the car to a shop somewhere and have them test the IAC. it would take like 5 minutes for them to check it out.

APACHE 64D · Post by **APACHE 64D** » Thu Apr 24, 2008 6:40 pm

the problem is not fuel pressue related i think. In order for me to start it i have to floored it and then once it starts it will stay on without a problem except the 3,ooo rpm crap. I can drive it and there are no misses or anything like it. it drives normal. Once you turn it off then it's back to square one. the car worked fine up until i replaced the gas tank. Bad fuel maybe?i'm going nuts here lo. but i love this car. I've had for a long time and never gave me any problems, i guess it was about time for a 18 yr car right? Thanks guys

SuzukiGhostRider · Post by **SuzukiGhostRider** » Thu Apr 24, 2008 8:31 pm

You test your IAC yet? I don't think it's bad fuel as your car would have trouble idling ,not over idling... Hmmm.... Get that IAC tested and get back to us. GL.

APACHE 64D · Post by **APACHE 64D** » Mon Apr 28, 2008 4:31 pm

Well, it isn't the iac lol. I bought a new one and the car started right away without a problem. Tried severals times during the day and it worked fine. However this morning when i tried to start it again the same problems. first the damn noisy which sounds like the lifters or the started not working, then the car misfired once gave it gas and it blew the 3 vacuum lines that go the manifold intake out. I'm really at odds here and have no idea what to do? i've got the gas and matches ready though. lol j/k.

JeffD · Post by **JeffD** » Mon Apr 28, 2008 10:08 pm

Hmm, it sounds like a temperature issue, or a moisture issue. I'm staring to think you may have a bad Incoming air temp sensor. All you have to do is find a reference chart that shows resistance values for different temps. check the sensor's resistance and see if it matches the value on the chart.
it's either that or you have a vacuum leak somewhere... start by eliminating all vacuum components by unplugging them from the throttle body and blocking off the hole. see if it runs alright without any vacuum components. then, if it's running right start plugging back in each line one by one testing each time. once you get the one that does cause a problem follow the line until you find the break. this test does also require that you block off the brake booster vacuum line and test that as well.
I hope this helps!

APACHE 64D · Post by **APACHE 64D** » Thu May 01, 2008 11:13 am

well, i've replaced the tps, gsr, map and iac. The same problem continues lol. It'll start up sometimes without a problems and the next day the problem described above comes back. I'm completely confused with this car now. The only thing i did first was to replaced the gas tank, before then it would iddle at 3,000 rpms but would start without a problem which is not the case now. Do you think it's bad fuel?maybe air in the system?I also forgot to mention that the dashboard is complete off since i wanted to double check the wire harness for any problems, would that have anything to do with it? I've check the vaccum lines and i can't find anything wrong there either. The map and tps were taken from a 1993 3.1. v6 manual car. Now what else can i do besides replacing the engine? thanks

1988GTU · Post by **1988GTU** » Thu May 01, 2008 1:24 pm

You might have forgotten to tighten the little hose going from the fp to fuel line in the tank. Or you might have connected the hoses wrong (hard to do, but has happened before) at the tank. Make sure the return line is hooked up properly too.

APACHE 64D · Post by **APACHE 64D** » Fri May 02, 2008 2:41 pm

nope, everything is connected the right way. This morning it took me flooring it for about 30 secs and it started up and ran just fine. Drove it for almost 15 mins without a problem. once it starts it keeps going strong, once it's off for a while that's when the problem comes back for some reason. I'm just gonna part the thing out or give it to the yard lol.

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