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2000 Quest, idle changes with foot on brake in drive.

19 messages,  Last post on May 18, 2009 at 8:04 AM

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#10 of 19 Re: No answers [hunter38] by steve_ HOST Apr 15, 2009 (8:31 pm)
Replying to: hunter38 (Apr 15, 2009 8:07 pm) A few of the early last generation Quests had a rough idle due to a dirty IAC valve off the intake manifold. Cleaning was the fix. Someone had a bad idle air control solenoid. Seems less likely than an injector problem though (but I'm really shooting in the dark here).   I wonder if it's at all related to the throttle plate? I clean that on mine every ~30,000 miles or so, but only when it makes my '99 hesitate pulling away from stop signs.
#11 of 19 Re: well here is what i have done... [hunter38] by petaka Apr 16, 2009 (4:57 am)
Replying to: hunter38 (Apr 15, 2009 7:20 pm) I had my 105k miles service done at the end of 2005: replaced spark plugs, timing belt and whatever the dealership said I needed. Last summer I had an injector replaced and my mechanic also replaced spark plugs and fuel filter. When my injector went bad the van performed badly at all times. My idling problems started very lightly last December and have increased ever since. I clean the throttle plate regularly - whenever it sticks. The van seems to be possessed only when idling. Step on the gas and the darn thing flies. Is the idle air control solenoid what keeps ticking once you shut off the engine? Thanks. Replies to this message: hunter38 (Apr 17, 2009 9:51 am)
#12 of 19 Re: well here is what i have done... [petaka] by hunter38 Apr 17, 2009 (9:51 am)
Replying to: petaka (Apr 16, 2009 4:57 am) ok well that rules out all the suggestions i had...hmm. I did pull off my distributor cap and clean the cam postition sensor and have yet to run into the problem again. I also havent kicked out any codes yet either, but may have not gone all the way through the drive cycle. I am still waiting to see if it happens again. the exhaust smells "cleaner" (no heavy gas smell) which is good. I still have to put the timing light back on again to check to see if it is jumping all over still. I will be working on this over the next couple of weeks so i will let you know if i get some revelation for this mystery problem.
#13 of 19 ah ha by hunter38 Apr 25, 2009 (10:27 am)
stumbled across in my reading another potential cause of the problem. The throttle position sensor that is sticking or acting up will cause the problems that we are encountering. Essentially if the sensor is not working correctly the engine computer does not know where the throttle position is and is continually trying to adjust causing a rough idle and finally a stall. This, i believe, also causes my problem of timing marks jumping all over the place since the computer is also trying to adjust timing based on an unknown throttle position. Problem should disappear during acceleration since sensor is no longer in play since it mainly adjusts air flow during idle. hopefully this is the solution. good luck!!   Replies to this message: hunter38 (Apr 25, 2009 10:39 am) steve_ (Apr 25, 2009 12:26 pm)
#14 of 19 Re: ah ha [hunter38] by hunter38 Apr 25, 2009 (10:39 am)
Replying to: hunter38 (Apr 25, 2009 10:27 am) thanks steve for setting me in the right direction on this one! Replies to this message: steve_ (Apr 25, 2009 12:26 pm)
#15 of 19 Re: ah ha [hunter38] by steve_ HOST Apr 25, 2009 (12:26 pm)
Replying to: hunter38 (Apr 25, 2009 10:39 am) Nice intuitive leap you made from a throttle body plate to the TPS.   Keep us posted on how it works out!   Steve, visiting host
#16 of 19 Re: well here is what i have done... [hunter38] by msixkiller Apr 30, 2009 (8:12 pm)
Replying to: hunter38 (Apr 15, 2009 7:20 pm) We had the exact same problem...very frustrating as where we are there are not "mechanics" that have the right equipment to work on Nissan's. But after 4 mechanic shops, 3 tows and all the things above replaced..finally we replaced the distributor and it is running fine. My question is the mechanic that fixed our van said that in two warehouses they had over 2000 of this particular distributor part for this particular van. He suggested keeping your receipt, there is probably a recall on the way...just a heads up.   Good luck, other than this problem..I love my Quest.   Michelle Replies to this message: hunter38 (May 03, 2009 6:03 pm)
#17 of 19 Re: well here is what i have done... [msixkiller] by hunter38 May 03, 2009 (6:03 pm)
Replying to: msixkiller (Apr 30, 2009 8:12 pm) finally got mine done....it was throttle postion sensor and mass air flow sensor in combination. i had just replace the MAF sensor last year and it was still under warrenty. saved me $160 bucks. took it in to have AC looked at (i live in vegas) and found out that it will cost me $1700. ouch. first real money i have put in the car in 9 years since purchasing. cant complain too much i guess. couple of other parts plus labor adds up pretty quick.
#18 of 19 No luck, so far by petaka May 16, 2009 (9:28 am)
I've cleaned EGR valve, IAC valve, throttle chamber, MAF sensor, checked and cleaned distributor, checked voltages on throttle position sensor. All those things have checked o.k. but the gremlin is still there. I am close to just giving up and let this van run its course. Still no ECM warning light.
#19 of 19 Finally, I got mine done by petaka May 18, 2009 (8:04 am)
Thanks to the Villager & Quest FAQ site (Google). Under subtopics look for "Low speed miss". Several people posted the same exact problem but somebody nailed it and posted the solution. All I had to do was replace the ignition wires and problem solved. I had checked the resistance on each of those wires and they checked ok and looked fine to the naked eye, but somehow when they got hot it seems to be a different story. The van has been for service several times but I don't think anybody knows the intervals for changing the wires. I'll be back from time to time and sooner if there are any changes.

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