1999 rodeo v6 wont start no idle

[metalheadinflames]

Hey there,

Bought my rodeo 1 month ago used with 59,000 miles and have already had two problems with it. the first problem was hard shifting and the dealers warranty covered half of the cost to replace asm switch.....okay so that problem fixed but know a new problem has begun. Since i have had it, you have to give the car gas when starting and sometimes i will die the first time you start it but always starts on the second or third time. But otherwise ran perfect. Two days ago, while on the freeway, the car died when i was slowing down( when i let off the gas). The check engine light came on and for the rest of the way home the car ran but died whenever you let off the gas. So i let it sit overnight and the next day it wouldnt even idle at all. Every time the car would turn over but instead of idleing it would die instantly. Got it towed to a mechanic and he told me today that i was the control sensor or idle control(something to do with the idle). He reset it and the check engine light went off and he says the car runs fine. But he also said if the light comes on again then it would be that idle sensor/control. What part is he talking about? Will a reset fix a problem like that? Any advice you have would be very helpful. He quoted me 700 to replace that part(he said the exact name but i dont remember but i know it had the word control in it and that it has to do with the control the idle.

[amigo-2k]

http://www.automotiveforums.com/vbul...hlight=harness

maybe a short in the wireharness.

[superfret78]

I think the part he is referring to is the Idle Air Control valve (IAC). Its an electronic valve that bypasses the throttle plate and lets air into the engine. It basically just controls idle speed. Sometimes they can get gunked up and then they get stuck, causing your car to idle funny or die. Sometimes just taking it off and cleaning it helps, other times the motor inside it that retracts the pintle is bad and the part needs to be replaced. Here's what it looks like:



Unless the 99 rodeos have something sitting on top of the throttle body (and I doubt that) that makes access to the IAC valve difficult..the labor shouldn't be much at all on this job if you take it to a shop.....and a replacement IAC valve is $50 at advance auto parts, so an OEM one from the dealer shouldn't be too outrageous either. $700 seems WAY high for an IAC valve replacement. Are you sure he didn't mentio anything else?

[metalheadinflames]

thanks for the info.....i will pick up the car tommrow. Do you think that the mechanic reseting the CEL will actually work(he said it did) or should i just plan on paying for some new part? i willpost what code it was telling him when i find out tommrow...do you know what the code is for the idle control valve?

[Canucklehead]

Originally Posted by metalheadinflames

thanks for the info.....i will pick up the car tommrow. Do you think that the mechanic reseting the CEL will actually work(he said it did) or should i just plan on paying for some new part? i willpost what code it was telling him when i find out tommrow...do you know what the code is for the idle control valve?

If all he did was reset the CEL then he did nothing that you couldn't have done by pulling the ECM fuse or disconnecting the battery for a few minutes. I doubt that the ECM software is made by Micro$oft, so don't expect resetting the CEL to miraculously make things all better.

As far as the codes that correspond to the IAC these are three of them;

P0505 - Idle Control System Malfunction

P0506 - IAC System RPM Low

P0507 - IAC System RPM High

[superfret78]

Yeah....resetting the CEL won't do squat.

[superfret78]

If the IAC valve gets stuck all the way out, no air is bypassing the throttle plate and as a result, the engine will die immediately upon start.

[metalheadinflames]

picked up the rodeo....mechanic said it was the throttle body? runs fine now but still having start up issues.sometimes it starts and dies still and sometimes it starts and idle high(slowly goes down though)but either way it always starts on the 2 or third start. As far as the stalling when driving it has only happened once so far but the idle seems perfect when driving around. I dont think it is the throttle body because the only issue it really has is the start up. The place i took it was an "import and domestic"mechanic...so that makes me think it could be something different.Let me know what you think?

[johnsm]

Originally Posted by metalheadinflames

Hey there,

Bought my rodeo 1 month ago used with 59,000 miles and have already had two problems with it. the first problem was hard shifting and the dealers warranty covered half of the cost to replace asm switch.....

Just curious. What is an "asm switch"?

John

[Ramblin Fever]

Sounds like the throttle body/EGR system needs to be cleaned.

An Import mechanic is a good idea, I intentionally have never taken my Rodeo to a domestic mechanic - I've heard they cause more harm then good as they take one look at the Isuzu engine and they "think" they know how to work on them.

[metalheadinflames]

thanks for the info...did it again tonight. starts and dies first time starting it.then almost started on the second but died then started on the thrid time but the idle bounced around alot(between 400 and 1300 rpm0 then stablized. Does that sound like throttle body and/or egr? let me know what you think. also what is the average price of the 60000 mile maitenence?

[marcre]

Originally Posted by metalheadinflames

thanks for the info...did it again tonight. starts and dies first time starting it.then almost started on the second but died then started on the thrid time but the idle bounced around alot(between 400 and 1300 rpm0 then stablized. Does that sound like throttle body and/or egr? let me know what you think. also what is the average price of the 60000 mile maitenence?

I may be wrong, but did you check the intake manifold gasket. These symptoms are similar to what happened to me. I had the gaskets changed and it fixed the problem.

[metalheadinflames]

check engine light came on today...went to autozone and read the code and it was p0101(maf or vaf ckt range/perf) Does this sound like the syptoms of a leaky intake mainfold gasket?

[marcre]

Originally Posted by metalheadinflames

check engine light came on today...went to autozone and read the code and it was p0101(maf or vaf ckt range/perf) Does this sound like the syptoms of a leaky intake mainfold gasket?

I can not remember the codes I was getting when I had my IMG changed. However, the codes I was getting was leading my mechanic to look at many things.

I ended up replacing the fuel and air filter, cleaning the EGR and the throttle body. I also did new spark plugs. All this cost me close to $600 and when I went to pick it up the mechanic said all was well and it was running strong. The second I got in the Rodeo and started it I knew it was not right. On the way home the CEL went back on.

Took it back the next day and the mechanic told me I had a bad spark plug. I did not buy this at all, but I played along. Picked it up and still bad. Took it back a few days later and after investigating on the web what might be wrong. A lot of people suggested the IMG, so when I went back I mentioned it. The mechanic said that it wasn't really giving any codes to suggest it, but he would give it a shot. An hour later they called and said that was the problem. I got a break on the price since it took so long for them to figure out.

Like I said, it is a known problem, so it is a good place to look at on these vehicles. It may not be your problem, but it does have characteritics of a bad gasket(s), it is worth a shot. If this is not your problem it will at least eliminate it as a possibilty.

All the stuff I had done was expensive, but it probably was due soon anyway. I would have done it myself for a lot cheeper, if I had more time.

Good luck and keep us posted.
Marc

[metalheadinflames]

noticed some bogging out(the car will hesitate then surge) but otherwise seems fine.