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Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 29943
Experience:  Automotive Repair Shop Manager, Technician
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Ford Explorer xlt v8 2002: Having my veh worked on they canno

Customer Question

Having my veh worked on they canno figure it out
Submitted: 1 year ago.
Category: Ford
Expert:  Eric replied 1 year ago.
HI,
Ok, he has done a compression test, but has he done a leakdown test of the cylinders yet?
Customer: replied 1 year ago.
No not to my knowledge
Customer: replied 1 year ago.
Vehicle does idle a little rough but drives well and has a lot of power while accelerating and while in bear
Expert:  Eric replied 1 year ago.
HI,
Ok, the next step is to do a leakdown test for either burnt or sticking valves, either of which condition will cause the current symptoms
Customer: replied 1 year ago.
While I appreciate the answer what I thought I was paying for was a series of potential causes for this problem because I sure would not advise anyone to use this service after they try an don't succeed step by step
Expert:  Eric replied 1 year ago.
HI,
Low compression in any of the cylinders cause a misfire. So, you can rule out spark and fuel.
There are only a couple of causes of low compression - burnt or sticking valves, engine timing off, worn rings.
I would assume your mechanic has by now verified the engine timing as that should always be done first for misfires.
So that leaves valves or rings. The leakdown test determines which.
No other potential causes of low compression.
I can list a whole bunch of misfire causes such as plugs, coils, pcm, fuel injectors, fuel pump, fuel filter, etc. BUT none of them cause low compression, so why mention what is not possible.
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