Question about 1994 Toyota 4Runner

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Rough idle 3.0 v6 no engine light on runs at higher rpms better

Changed engine out replaced knock sensor and it s wiring same pvc valve and egr valve havent checked comppression yet but plan to next.not sure what could be causing rough idle also new intake and plenum gaskets and sprayed carb cleqaner around to chegk for vacume leak and checked tps seems ok.

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6ya6ya
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Posted on Jan 02, 2017

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  • 166 Answers

SOURCE: 2000 Camry 4 cyl 2.2L.

sounds like you have a problem with the spark the coil may be on its way out or there may be oil in the spark plug holls shorting out the spark.
your best bet is to pull the leads out 1 at a time and and look down and check for oil if there is oil there get a new rocker cover gasket.
if no oil refit plug leads loosely and start the car remove one lead at a time slowly and look at the spark cumming out the end off the lead is it blue? if so it is ok if it is yellow and dull you have a coil problem. also check that the spark is only coming out the end of the lead as it may be coming out the side of the lead and shorting to earth,
you can do this by slowly moving the lead around the top of the spark plug holl and see were the spark is coming from

be carfull no to shock your self as it hearts like hell

good luck

Posted on Jan 01, 2009

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michigan man
  • 3533 Answers

SOURCE: engine idles rough, misses at 2500-3000 rpm's

i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth

Posted on Feb 14, 2009

  • 40 Answers

SOURCE: 93 toyota pickup 22 re motor, idles very rough

it is possible.

Posted on Mar 05, 2009

MNfisherman
  • 11896 Answers

SOURCE: 2001 toyota celica vaccum leak, po171 keeps comingon

problem is most likely your purge canister itself.

Posted on Apr 15, 2009

  • 19 Answers

SOURCE: 86 toyota corolla, dies at stoplights and idles rogh

well you could try to get a vacuum gauge and see if your car reads what it supposed to and if you buy one it could tell you what it could be.

Posted on May 21, 2009

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1 Answer

I meant how do you replace an egr sensor in a 2005 rendezvous?


A faulty egr would not create a high idle issue. if an egr valve were to open while idling then it would create a heavy stumbling engine or it would die right out. if there is a check engine light on (or service engine soon light) have the codes pulled. Failing that then I suggest taking it to a reputable shop

Feb 23, 2013 | 2005 Buick Rendezvous

1 Answer

I got a 1995 chevy blazer s10 with a 4.3 v6 engine wont start when it does start it is missing bad had it analized at auto zone came back a knock sensor, tps sensor, & egr valve what should i check...


In order I would go for the EGR valve, then the TPS. A malfunctioning EGR will keep the car from starting and make it run very rough if you do get it started. The car will run without the knock sensors so I would wait until it runs better before getting those. There are two knock sensors one for each bank of cylinders on the V6. Autozone should be able to tell you which sensor goes on which side.

Feb 08, 2011 | Chevrolet Blazer Cars & Trucks

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Engine runs rough and will quit running at stop light unless you keep your feet on gas pedal and brake pedal. have changed fuel pump, plugs,wires and sensors. Could it be a magnetic sensor or a vacuum...


your idle air control valve may be the problem. This device controls the idle speed. It may be gummed up with deposits. this is what it the part looks like; http://www.rockauto.com/catalog/moreinfo.php?pk=382734

you can remove it and spray it with carb cleaner to loosen up the valve or replace the assembly.
A faulty EGR valve and/or PVC valve will cause similar symptoms.

Sep 10, 2010 | 2001 Ford Focus

2 Answers

My 2003 Tahoe idles rough and the check engine light is on.


sounds like vac leak to me take carb cleaner spray around intake manifold listen for change while engine runnig these veh are known for cracked plenums. hope this helps THUNDERBOLTZ

Jun 23, 2009 | 2003 Chevrolet Tahoe

1 Answer

Engine code 43 lights up engine has spark knock repaced esc module knock sensor tuned it up it runs rich and has the spark knock isssue


code 43 throttle position sensor out of adjustment.not working.if you replace knock sensor and it still spark knocking.make sure the wire connector is not broken.go to higher octane gas .make sure engine timing is correct. also make egr valve is opening when it suppose to it will cause detonation.you will need a scanner to check tps and egr valve.

Jun 17, 2009 | 1992 Chevrolet K1500

1 Answer

What are the symptoms of a faulty oxygen sensor?


bad oxygen sensor will make a car run rough.also mass air flow sensor egr valve sticking open or pvc valve open.idle speed control problems.have your car scan.because there are many sensor causes it to run rough.

Apr 16, 2009 | 1999 Pontiac Grand Prix

2 Answers

Malfuntion light coming on...egr valve may need replaced


the range from a simple sensor issue with no symptom except a check eng light to a rough idle with a light.

Mar 20, 2009 | 2005 Dodge Grand Caravan

3 Answers

1995 Chev S10 4.3L V6 rough idle and under power


This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.

What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.

I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.

What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.

Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.

Dec 02, 2008 | 1994 Chevrolet S-10 Blazer

2 Answers

Engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger


Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..

Nov 23, 2008 | 1999 Ford Ranger SuperCab

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