3rd & 4th Generation (1992–1996 & 1997–2001)Toyota Camry Discussion for years: 1992-1996 & 1997-2001
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I have a 1994 Camry 4 cyl 2200 automatic. It has developed an intermittent rough idle when in gear i.e.: at a stop light. But sometimes, it relaxes and is so mellow feels like it stopped. However, that is infrequent. Mostly the hard/rough idle.
I have changed plugs, wires, distributor cap and rotor.
I also have an intermittent check engine light and wonder if a plugged EGR would cause the rough idle.
Also, does anyone know how to remove the EGR? I can see the two mounting bolts and nuts on the back of the engine, but there is a large nut below it thast seems impossible to get a wrench on.
Do you think a blocked EGR could cause the hard/rough idle?
I doubt it. A blocked EGR would have a low flow. There should be no flow at all at idle. If the EGR was allowing flow at idle it may idle rough. It could be a EGR control problem, carbon on the EGR valve seat not letting it close completely. Or it may not even be an EGR problem, it could be as simple as a dirty IAC. I would thoroughly clean the IAC first. And if the problem persists investigate an EGR or EGR control circuit problem.
Last edited by Pvt-Public; 11-25-2010 at 10:50 AM.
I just fixed a rough idling issue that I had. I can be many things. Mine happened to be a bad ( or clogged ) fuel injector for cylinder #2.
But to rule this out, try putting a bottle of Lucus Fuel Injector cleaner in the gas tank ( or the Chevron equivalent ) and let it run it course. If it is a minor issue with the fuel injector, this will solve it. It is an inexpensive step that can never hurt. It can only do good. If it is not the issue, you still did some preventive maintence that only helps.
Please keep us updated to the steps you take to resolve this issue.
It will help everyone.
I doubt it. A blocked EGR would have a low flow. There should be no flow at all at idle. If the EGR was allowing flow at idle it may idle rough. It could be a EGR control problem, carbon on the EGR valve seat not letting it close completely. Or it may not even be an EGR problem, it could be as simple as a dirty IAC. I would thoroughly clean the IAC first. And if the problem persists investigate an EGR or EGR control circuit problem.
Thank you. I will try cleaning the IAC and let you know.
Quote:
Originally Posted by coffee-3000
I just fixed a rough idling issue that I had. I can be many things. Mine happened to be a bad ( or clogged ) fuel injector for cylinder #2.
But to rule this out, try putting a bottle of Lucus Fuel Injector cleaner in the gas tank ( or the Chevron equivalent ) and let it run it course. If it is a minor issue with the fuel injector, this will solve it. It is an inexpensive step that can never hurt. It can only do good. If it is not the issue, you still did some preventive maintence that only helps.
Please keep us updated to the steps you take to resolve this issue.
It will help everyone.
Thanks. I ran some Lucas fuel injector cleaner last month. On my last fill up which was tuesday, I put in some Sea Foam as I hear it mentioned alot on these threads. That resulted in better pick up and better overall performance, but I still get the rough idle while stopped and in gear. It is idling at 800 rpm and feels "hard".
someone else on here suggested cleaning the IAC. I'll give that a go and let you know what happens.
Last edited by LynchburgCSI; 11-26-2010 at 09:42 PM.
Reason: merged!
I just read the thread about cleaning the IAC. It was great. But I have a stupid question. It looks like the thread shows two coolant hoses and a third hose. What is the third hose going into the IAC ?
And why does coolant run into the IAC ? To keep the IAC warm on a cold morning ? Or to keep the IAC cool on a hot day ?
I just read the thread about cleaning the IAC. It was great. But I have a stupid question. It looks like the thread shows two coolant hoses and a third hose. What is the third hose going into the IAC ?
And why does coolant run into the IAC ? To keep the IAC warm on a cold morning ? Or to keep the IAC cool on a hot day ?
Yeah it helps keep the IAC warm so it operates better in colder conditions.
There is a third hose that connects ; its a vacuum line
Well, I just had the Injector cleaning at a reputable local shop, I also opted for the deal which included transmission flush and coolant flush just because I need both, but I still have the rough idle AND now it varies in speed and has a howling type noise after driving awhile and putting it in park.
The previous situation of sometimes settling down and idling smooth and quite has disappeared.
Would you agree we have narrowed it down to the IAC?
Mister Perkins, I must again say thank you. I have used the method described to clean the IAC using Sea Foam spray and spraying a liberal amount into the IAC hole. I also used a tooth brush and clean shop towel to clean the inside opening of the throttle body and butterfly. The difference is amazing! The only reason I didn't remove the IAC completely is that while attempting a start at it, it felt as though I might strip the threads as the screws were very tight. I am trying to talk our church mechanic into removing it for me, but he seems reluctant. I am convinced it still needs thorough cleaning because even though things are better now, I still get an occasional rough idle and it has begun surging. This I feel is a symptom of sticking.
Question, in these threads I have heard mention of "pre-detonation". What is that ?
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rough idle '94 Camry 4 cyl
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