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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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94 ford ranger, 4.0, 90,000 MILES #2 spark plug center

Customer Question

94 ford ranger, 4.0, 90,000 MILES #2 spark plug center electrode was eaten up when I changed pugs and wires. Was told this was a lean issue.. Problem got worse after changing plugs and fule filter. took it to the mechanic Have changed computer, O2 sensors, crank sensor, thermostat, fuel filter (twice). When coming up a hill, starts running rough and overheating. has been in the shiop for 6 weeks off and on and they cannot find the problem
Submitted: 2 years ago.
Category: Ford
Expert:  EricFromCT replied 2 years ago.

Hi. Have they checked the headgaskets yet?

Customer: replied 2 years ago.
No but if it was headgaskets wouldn't it be leaking water?
Expert:  EricFromCT replied 2 years ago.

No it can leak into the cylinder. And those heads are actually common to crack between the valves.

Expert:  EricFromCT replied 2 years ago.

But yes over time the coolant level would go down. But it does not take much of a leak to cause problems in a cylinder.

Customer: replied 2 years ago.
also wouldn't it be smoking white out the exhaust? The problem was intermittent for a while now just runs poorly all the time
Expert:  EricFromCT replied 2 years ago.

Sometimes on first start up. It can cause the cylinder to lean out and burn your plug. If the shop had it for 6 weeks I am assuming some basic stuff must have been checked. A leaking head gasket can also cause overheating when putting a load on the engine.

Customer: replied 2 years ago.
went to the mechanics and they were doing a compression check.. had 2 bad plugs, only neither one of them were in the original cylinder that was bad. These were in the #3 and #4 cylinders. The one that was originally bad was clean and wet, the 2 bad ones were dry and the core was gone. What would cause the lean problem to jump cylinders? MAF sensor? Compression varied on all cylinders, none less than 155psi, most at 175.
Expert:  EricFromCT replied 2 years ago.

How would cylinders 3 and 4 have bad plugs when in your question you stated that you just replaced them?