Eclipse 1993 surging during idle

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

jilavsky@gmail.com - 10 Sep 2008 03:48 GMT

Hello,

I am lost here. I bought my son 1993 Eclipse (2.0 l, fwd, non turbo)
and after few days it seems to start doing weird surging on idle. I
have tried and tested various items, replaced spark plugs, PCV valve,
and some other "cheap" stuff. Measured according to Heynes manual
various sensors. Still surging.
These are symptoms: on idle surging between regular rpm and about
1500rpm, when I run it and release gas pedal, the return to idle is
slow and there seems to be noticeable delay (0.5 sec or may be 1 sec)
to drop to idle. Like it the car was pulling little bit longer.
It seems to go sometimes away - happened few days ago, wnet away,
happened later for 2 days, went away, now is happening again...
Anyone has suggestion what to look into now?

Thanks a lot for any suggestions...

Honza

Reply to this Message

Stewart DIBBS - 10 Sep 2008 12:48 GMT

> ...it seems to start doing weird surging on idle.

Common problem on older cars. The throttle body needs cleaning. This is best
done by taking it off and carefully cleaning all the carbonised oil off the
internals so the butterfly opens. Also replace the air filter. Make sure the
harness connector on the air filter can is clean (use WD40) and undamaged,
likewise the harness connectors around the throttle body.

Also on the throttle body is the air idle motor (AIM). These sometimes fail.
See www.dsm.org and search for surge. I doubt this is the problem as the
surge comes and goes. The AIM has a cover. If you can get this off (CARE:
there's loose bits under it) check the movement of the gears and lubrication
after you clean the throttle body.

Clean out the intake hose from the air filter to throttle body. This gets
gunked up by oil from the cam cover breather.

Make sure that the coolant temp sensor (the 2 pin device under the
thermostat housing: the 1 pin device is the temp gauge sender) wires are
undamaged and making good contact. Also make sure the O2 sensor connections
are OK.

Signature

regards
Stewart DIBBS
www.lancerproject.ca

Reply to this Message

jilavsky@gmail.com - 11 Sep 2008 03:10 GMT

Thanks a lot... Looks like interesting Saturday.

H.

> <jilav...@gmail.com> wrote in message
>
[quoted text clipped - 25 lines]
> regards
> Stewart DIBBSwww.lancerproject.ca

Reply to this Message

Gyzmologist - 21 Sep 2008 02:21 GMT

> Hello,
>
[quoted text clipped - 14 lines]
>
> Honza

I had the same problem that was caused by the fast idle air valve. This
is a thermo-mechanical device that when fails cannot be repaired. What I
did was buy a block off plate (eBay, about $10) and haven't had any
problems since. When I start the car now it first idles at 1500 RPM,
then settles down to normal after a short while. If you live in a cold
climate then you may have to use a little throttle to keep the engine
running for a few seconds until it will idle on its own.

Signature

Gyz

If a man is speaking in the middle of the forest and there is no woman
around to hear him, is he still wrong?

Reply to this Message