my 91 max idles at about 1500 rpm after I cruise on the hwy sometimes. If I let off the brake at a stop light when this is happening the car tries to drive itself (30-35mph). anyway once I stop and put her in park I can rev the engine past 3000 or higher and then the idle eventually drops back to down to 800rpm or whatever it usually idles at. Any Ideas? Fuel filter? Note the trottle cable does not stick this is not the problem. Thanks

 

Sounds like a gummed up throttle plale....Go get some throttle body cleaner and go to town on it...

 

Hey i got a question relating to this sort of issue. When i start the car on idle it'S at 1200 RPM and then slowly going down to 750. Could it be the same problem?

 

Sounds fine to me..

 

Umm, 'cause I do remember the car starting smoother. . . could it be the air filters?

 

Could be a 15 yr. old car...


I guess you could clean the t/b...See if that helps....

 

Sorry my "noobness" as they say but what's t/b?

 

throttle body

 

What else could cause this symptom

I don't want to have to live with the dumb excuse on its 17 years old so it can be a screwed up car I have the same prob but I just let it idle down before I change gears so it isn't as hard on the trans ....

Thanks Guys

 

timing belt... you need to clean it

 

tuberculosis

i'm surprised nobody has mentioned the iacv in this thread. probably the cluprit

 

It could be other things, such as a bad temp sensor that's telling the computer the engine is cold or a pollution control. As I remember it the idle comes up on the car under certain engine conditions (which I don't remember) that produce pollution. The car produces more pollution at idle. Perhaps its a bad O2 sensor that's indicating too much fuel in the exhaust (just a guess). There's also the power steering and a/c idle up relays and solenoids that could be acting up.

 

does the temp gauge dip while on the highway? thermostat could be stuck open causing overcooling?

 

where is the idle air control valve and those a/c-p/s relays at? Temp stays right in the middle of the sweep when car is warm. I replaced the thermostat like 6 months ago.

 

iacv is underneth the thottle body. you can clean it out with throttle body cleaner.

 

He has a vg=not under the t/b....

It is to the right of the t/b...

 

how did you know what I have? I think your right though thats what mine looks like under the hood. What is the diff between the vg and ve?

 

because your car is a 91. the vg is sohc, the ve is dohc. don't be sad though because the vg is a lot more reliable, quiter, easier and cheaper to work on.

 

word.......But why does my car have two cams gears if it is a sohc. I have had the timing cover off and it has two what would appear to be cam gears

what years have the VE?

 

2 cams...one for front 3 cyl the other one for rear 3 cyl.

on the VE (DOHC) there's 2 cams on each side...so really 4 physical cams in the car.

92-94 SE models have the VE motor.

 

gotcha......... thanks, so dohc is really like qohc in the VEs

 

ummm i guess you can say that but in reality and in the marketing world they list SOHC and DOHC are number of cams on each cylinder head.

for example...
a DOHC inline 6 cyl would have 2 physical cams but it's still called DOHC motor.

a DOHC V6 motor would have 4 physical cams on the motor but it's still considered a DOHC motor since there's 2 cams per cyl head.

 

I understand

 

haha i knew he had a vg (i have a ve) and i took a chance that they were the same on that point but i got

 

ve is better just cuz....

 

So I can use TB cleaner to clean out the IACV-AAC??
What screws do I take loose?

r/Mark

 

I wouldn't reccomend cleaning the IAC with throttle body cleaner, as I was advised not to on my f150, but I don't know the sensitivity on these cars. But to play it safe get some electrical contact cleaner (It leaves no residue) There is a little screw on top of your IAC to test if it needs cleaning, if you spin it and you're idle doesn't move, it's most likely gummed up or something, take it apart and spray it out good with the cleaner. Also, a good idea might also be to clean your MAF (Mass Air Flow) This is located at the very beginning of your intake tube (closest to airbox) and if you look in the tube you will see mesh and a gold thing. Just spray the crap out of it with the electrical contact cleaner.

Hell, now that you're messing with the air intake tube might as well take it off and clean your throttle body and butterfly plates too.

Have fun
________
BABE GERMAN
________
EXPERT INSURANCE

 

Doing all this will help out your mpg too.

 

Clean the throttle body body!

 

Wierd, had the same problem today. Got off the highway, into the city and into my driveway, and noticed that the idle was high, idling at 1200RPM or so. Revving the engine didn't do anything. Turned the car off, started it again, and idle back to normal. Car ran perfect all summer, and still no problems, first time it's done this. Wonder if it's outside temperature related somehow? I'll keep an eye on it, and planning to clean the IACV this weekend. I'll let you know if it comes back.

 

My 87 2nd gen is doing basicly the same thing after 88 W block engine swap.

But it idles at like 2k and no matter what i do , adjust tps , Adjust throttle cable and dissconnect the ICV.

..

When istart mine up ill have to rev the engine up to like 2 k with the gas pedal and then hold it there for about 1 min then let off or it will stall ...

But once i let it sit for like 5 mins the idle will go up to like 1.5k and then i go drive it around and stop at stop signs and lights it will be at 2 k and i will have to pull the gas pedal up with my foot and then it will idle back down to 1.5k...

Never ending issues!!!

 

clean your IACV and TB and check your coolant sensor. My idle surges but my connector is corroded up and my sensor is good. but the computer thinks its bad.

~Alex

 

I want to know what is the solution for that. Did you ever fix this problem. Thanks

 

I got some carb cleaner and sprayed it into the metal intake, without actually exposing the throttle body. I only does it now and then. havent got around to getting to the trottle body and cleaning the iacv