1996 Toyota Avalon Engine runs rough at idle and in drive

Tiny
JERRYALEX
  • MEMBER
  • 1996 TOYOTA AVALON
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
Hi, My car has started running rough at idls and when I put it in drive and dirve it along since last week thursday.
I am wondering if it could be the gas filter?
Can you help please?
Thanks,
Gerrard Misquita
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Sunday, November 8th, 2009 AT 9:53 AM

4 Replies

Tiny
KHLOW2008
  • EXPERT
Hi Gerrard Misquita,

Thank you for the donation.

When engines run rough, it could be ignition or fuel that is causing the problem.

Mostly it should be ignition. Check the spark plug conditions and the idling speed. If the spark plugs are bad, they would misfire causing the rough idling. Likewise so does ignition items such as plug wires and igniton coil.

Is the Check Engine Light showing?
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Sunday, November 8th, 2009 AT 11:21 AM
Tiny
JERRYALEX
  • MEMBER
Hi Bob/Ken,
Thanks for your reply. I wanted to tell you when this really happened and what was done.

Last week Sunday I purchased a can of Carburetor cleaner. Then I undid one vacuum hose at a time leading to the intake manifold and sprayed a bit of it into the intake. (I have done this in the past and the engine seemed to run real good).

But this time I did something real stupid. I thought I could spray a little into the vacuum tubes this way they would clear up. That's when all this started to happen.

To resolve the problem: I undid one vacuum tube one at a time whilst the engine was running and let it run a bit so any liquid would evaporate. This seemed to resolve the problem.

Last Thursday the car was running fine but was very low on gas (Near empty), so I filled up some gas and parked my car immediately. The next morning when I started it, it began running real rough and it has been ever since.

I hope this might give you a better understanding in the situation of my car problem. May be you may understand what really went wrong.

Hope you can really help.

Thanks very much,

Gerrard Misquita

updated 11-9-09

I took your advise yesterday and yes the car started running smooth after cleaning the spark plugs but in about 10 minutes is was back to normal (Very Rough engine).

This morning I took my car to Toyota and they investigated the case and they say it is the VSV valve that needs replacement (it will cost $600 CDN). Do you think this is really what the problem is?
And the best part is they say they will see if it solves the problem. (Is this a trial and error fix?)

I do not know why they could not just clean the valve and try it. Today there are all sorts of solvents that can clean almost anything.

Gerrard
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Sunday, November 8th, 2009 AT 11:59 AM
Tiny
KHLOW2008
  • EXPERT
Under such circumstances it could be bad gas that was put in causing the problem.

If you did not put in too much gas, I would suggest draining them out and refilling with new gas.

Check the spark plugs, bad gas can cause them to misfire and go bad.
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Monday, November 9th, 2009 AT 4:48 AM
Tiny
KHLOW2008
  • EXPERT
Hi Gerard,

Please use the reply to question link so that I will be notified if you post any replies.

The VSV are known to go bad causing the problem as derscribed and you are correct about cleaning solvents which might be helpful.

Unless the VSV coil is bad, there is a possibility of cleaning the solenoid. Remove the VSV solenoid and use carb cleaner to soal the internal valve ports and use compressed air to clear out the dirt. Use WD 40 to spray into the VSV ports and apply voltage to the solenoid terminals to make the solwnoid click to prevent it from sticking. Repeat above process one more time to clean any resuidual dirt in valve and retest.
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Wednesday, November 11th, 2009 AT 8:31 AM

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