Car troubles please help...

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turbolover - 01 May 2006 05:02 GMT

My '95 mustang has a jerky acceleration when it warms up and car shakes
when I'm sitting at red light. When I start the car it runs ok but it gets
worse when the car warms up. I replaced spark plugs, put in injector
cleaner into gas but that didn't help. Does anybody have any ideas?

Thanks

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Backyard Mechanic - 01 May 2006 05:18 GMT

> My '95 mustang has a jerky acceleration when it warms up and car
> shakes when I'm sitting at red light. When I start the car it runs ok
> but it gets worse when the car warms up. I replaced spark plugs, put
> in injector cleaner into gas but that didn't help. Does anybody have
> any ideas?

What engine? Have the codes read out. Is the Engine lite on?

Fuel filter, plug wires, dist cap, rotor

Clean the MAF.

What is it idling at in RPM?

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Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

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Hollywood - 01 May 2006 22:10 GMT

I have a similiar problem with the idling on one of my fox bodies. Yet
it's only when the motor is cold. I believe the compensation system
linked with a fault air conditioning unit might be the case.

As backyard suggested, get a code readout/printout. It could be a
simple vacuum leak.

Holly

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Backyard Mechanic - 02 May 2006 15:59 GMT

> I have a similiar problem with the idling on one of my fox bodies. Yet
> it's only when the motor is cold. I believe the compensation system
> linked with a fault air conditioning unit might be the case.
>
> As backyard suggested, get a code readout/printout. It could be a
> simple vacuum leak.

Everyone should know what normal idle RPM is... and when something is
amiss, make note of the tach.

typical when warm:
5.0 - 650
3.8 - 750/800
2.3 - 900/950

A vacuum leak will cause roughness and HIGHER rpm.
A bad IAC valve, usually LOWER RPM

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Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

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