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indy-tech
indy-tech, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 6794
Experience:  All import and domestic car repairs and diagnostics
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2002 au havic ticfod xr8 has a miss on no4 cylinder have

Customer Question

2002 au havic ticfod xr8 has a miss on no4 cylinder have checked coil packs ,plug leeds ,fuel system, compression good , push rods good, rockers good,computer not showing any faults ,is there any other idears
Submitted: 1 year ago.
Category: Australia Car
Expert:  indy-tech replied 1 year ago.

Do a exhaust back pressure test a bad catalytic converter could be causing you this misfire .

Then if compression is good and low then using a noid light check the injector wiring harness on

the 4th injector ..Seen injector drivers in the ECM fail and cause this .

Leak down test on Number 4, a bad valve not closing fully also a possibility even though the compression test is showing

good .

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Kind regards Greg.

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