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Variable Speed Belt
What causes a car to jerk forward & backward, other than fuel filter?
The car is a 95 Ford Escort, manual transmission. The jerking is somewhat variable in onset, but very noticeable both while driving at a constant speed (around 30 mph and at other speeds not just in 3rd gear) and accelerating uphill. The car also gets somewhat poor gas mileage (30 when it should be 35+), has a hard time accelerating uphill, and I can occasionally smell a small amount of gas. There is NO check engine light.
What I've done (don't laugh):
-checked the air filter was clean
-changed the fuel filter
-new spark plugs
-spark plug cables are fine
-cleaned MAF sensor
-cleaned throttle body intake
-ran a couple cups of fuel injector cleaner
I'm not really sure what the problem is at this point, possibilities include transmission (?), O2 sensor, timing belt, random other sensor, or worse? I can add details as necessary.
Thank you!
Doesn't sound like a trans problem to me I guess it could be possible, but clutch slip is usually not intermmitant especially if it cable operated, and an automatic would be much more likely to cause a buck or surge. It sound to me like a miss. Are all plugs gapped correctly? Are you sure cables are fine or do they just look okay? Pay attention to the specific RPM range the problem occurs at and the engine load? See if you can get it to happen at the same approximate RPM in different gears. If it does then it's most likely a spark problem? may also be a coil prob, or slipping timing belt. Good luck P.S. you should never smell gas, get that checked out!
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