1996 Geo Metro INTERMITTANT BACKFIRING, HESITATION, IDLE UP

CUTNSHOOTCAMELRIDER

MEMBER
1996 GEO METRO
4 CYL
2WD
MANUAL
212,000 MILES

3 cylinder.

I have recently purchased a 96 geo metro 1.0. I'm having an intermittant problem that I thought was related to TPS, changed it set it and it seemed to work fine, but started again. It gets to the point where it is not drivable. Items that have been replaced or checked are:

EGR Valve replaced
TPS replaced and set
vacuum hoses replaced
spark plugs replaced
distributor cap replaced
fuel filter replaced
fuel pressure checked and was in spec
crank shaft sensor replaced
cleaned carb body
changed oil\filter. 5w30 mobile one
checked compression all within spec on high side and not more than 5 apart. Don't remember what they were now.
ran gas treatment lucas. Burned 2 tanks of gas at least.
coasting down the road with clutch in it revs up and down up and down without any pressure on gas peddle. Was getting EGR code PO400 until cleaning EGR passage way with sea foam and screw driver. I now have no codes. I have $250 scanner to check things with. I currently don't have any check engine lights.

all of the above were done after purchasing car. Person sold it for this reason.

I would be greatful for any help on this matter.

thanks,

cutnshootcamelrider

3 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi
Need a little info to help
With engine running turn on headlights does RPM go up? Does car Have A/C?
Let me know
Thanks for donate

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Tuesday, September 22nd, 2009 AT 11:01 AM

CUTNSHOOTCAMELRIDER

MEMBER
2 POSTS

I do remember that it did something distinct with the head lights were changed. Unfortunatly haven't been at it for a while. I do believe that it surges when they are turned off when at a stop. It could be the other way around though. As far as the AC goes, the ac is dead and is not ran. Was told the clutch was out.