rough idle (toyota corolla 1995)

The idle sound is much loud than before in the morning worming time.
Even during driving when I stopped in front of red light, the rough
idle sound was pretty loud and I could feel the steering was vibrating
a little due to the rough idle.

During driving, it was OK.

Please help.

Thanks

--
Posted at author's request, using [url]http://www.AutoBoardz.com[/url] interface
Articles individually verified to usenet standards. Visit URL to contact author/report abuse
Thread archive: [url]http://www.AutoBoardz.com/rough-idle-1995-ftopict202711.html[/url]

"johncar" <none@000.com> wrote in message
news:960717_0abd246d25fe49d113fbb2956c05feb7@autoboardz.com...[color=blue]
> The idle sound is much loud than before in the morning worming time.
> Even during driving when I stopped in front of red light, the rough
> idle sound was pretty loud and I could feel the steering was vibrating
> a little due to the rough idle.
>
> During driving, it was OK.
>
> Please help.
>
> Thanks
>[/color]

Where are you located? How many miles/kilometers are on the odometer? What
is the recent service and repair history? What is the idle RPM? Do you
have an automatic or a manual transmission? If you have an automatic
transmission, does the idle smooth out in neutral?

Check for cracks in the plastic intake tubing between the air filter and the
throttle body. Check for engine vacuum leaks. Check the idle air control
valve (if equipped with one).
--

Ray O
(correct punctuation to reply)

Really appreciate your response.

Area: Chicago
Recent temperature: 43 F (day time)

Car: Toyota Corolla 1995, Automatic
Mileage: 162,000

Basically I didn’t give service in the past 4 years except oil(3000
miles once), tire, bettary and filter changes. All belts were changed
when the car was 77,000 miles.

I don’t know how to check the idle RPM.
The car has same idle sound when the car in neutral. (checked tonight)

I couldn’t find any cracks in the plastic intake tubing. (checked
tonight)

Not sure how to find out the vacuum leaks.

Put hand on the engine especially on the area of timing belts can have
rough feelings. (like sounds from airplane)

"johncar" wrote:[color=blue]
> The idle sound is much loud than before in the morning worming
> time.
> Even during driving when I stopped in front of red light, the
> rough idle sound was pretty loud and I could feel the steering
> was vibrating a little due to the rough idle.
>
> During driving, it was OK.
>
> Please help.
>
> Thanks[/color]

"johncar" <none@000.com> wrote in message
news:960878_8e358ed031ff410d55d69046506bb1c1@0000.com...[color=blue]
> Really appreciate your response.
>
> Area: Chicago
> Recent temperature: 43 F (day time)[/color]

By any chance, are you near the northwest suburbs?[color=blue]
>
> Car: Toyota Corolla 1995, Automatic
> Mileage: 162,000
>
> Basically I didn't give service in the past 4 years except oil(3000
> miles once), tire, bettary and filter changes. All belts were changed
> when the car was 77,000 miles.[/color]

If it has been more than 60,000 miles since the spark plugs, distributor
cap, and rotor were changed, then I would start by replacing those parts
with Denso or NGK brand parts.

There were 2 engines available in 1995 Corollas - a 1.6 liter (4A-FE engine)
and a 1.8 liter (7A-FE) engine. Make sure you know which engine you have
before shopping for parts

If the timing belt has not been changed for 90,000 miles, I would consider
getting it changed.

I would also think about getting the transmission fluid changed (do not get
the transmission fluid flushed - fluid change only!) after you get the car
running correctly.
[color=blue]
>
> I don't know how to check the idle RPM.
> The car has same idle sound when the car in neutral. (checked tonight)[/color]

If there is no tachometer in the instrument panel, then you would need to
hook one up. It would be helpful to know engine RPM but not critical to
diagnose the problem.[color=blue]
>
> I couldn't find any cracks in the plastic intake tubing. (checked
> tonight)
>
> Not sure how to find out the vacuum leaks.[/color]

The best way to check for vacuum leaks is to connect a vacuum gauge.
Otherwise, look for any loose or disconnected hoses.
[color=blue]
>
> Put hand on the engine especially on the area of timing belts can have
> rough feelings. (like sounds from airplane)[/color]

This may be due to worn spark plugs.


--

Ray O
(correct punctuation to reply)