I recently replaced the computer in my 2002 Toyota 4-runner. Now my car is again misfiring and my mechanic says one of the cylinders is shot. Is this something they could've found when my spark plugs were also replaced?

Asked by Nov 10, 2015 at 07:52 PM about the 2002 Toyota 4Runner SR5 4WD

Question type: Maintenance & Repair

In diagnosing the computer problem, my mechanic went over my car
thoroughly before diagnosing the computer malfunction.  Shouldn't he have
noticed a faulty cylinder?

6 Answers


If your computer was malfunctioning then your mechanic may not have been able to detect the misfire. What exactly do you mean by a faulty cylinder?

3 out of 3 people think this is helpful.

Really... a shot cylinder can mean sooooo many things

2 out of 2 people think this is helpful.

Hi Ford!

2 out of 2 people think this is helpful.

Yes, you're mechanic should have seen the misfire by the condition of the spark plug(s) of the effected cylinder(s). In the old days that was called "reading the plugs". A misfire can also be detected at the tailpipe. A steady exhaust stream indicates that all cylinders are firing normally. But a " putt-putt-putt" at the tailpipe is an indication that the engine is misfiring. HTH. -Jim

1 out of 1 people think this is helpful.

Hi back at ya FoR and Jim

2 out of 2 people think this is helpful.

Hi Fordnut! -Jim

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