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| Eighty Eight Includes the '97-'98 Regency and '96-'99 LSS Models |
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#1
05-31-2009, 06:43 PM
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1988 Delta 88 rough idle
1987 88 started bucking, cutting off, wouldn't start for a few days... replaced battery, alternator, plug wires, starter,idle air control valve. Took ignition control module to autozone for test.. passed. got a icm for junkyard, but failed test. got a brand new icm for autozone. the original icms had same symptoms but the icm from the junkyard makes my car run but failed autozone test. with junkyard icm has ruff idle. need help plz
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#2
05-31-2009, 08:13 PM
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Re: 1988 Delta 88 rough idle
Hmm, rough idle means? Misfire, does it acclerate ok or just miss/act rough at idle. ? Many things can cause what you descibe, bad plug, crossed wires, bad coil, bad injector, stuck egr, low compression in one or more cylinders.
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#3
05-31-2009, 09:33 PM
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Re: 1988 Delta 88 rough idle
once the car starts up and achieves operating temperature idle speed drops and almost stalls then tries to correct itself but slows back down. it does not do this with the mass airflow diconnected
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#4
06-01-2009, 12:11 PM
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Re: 1988 Delta 88 rough idle
Make sure you have sufficient fuel pressure, then replace the maf, or check the connector, they were noted for the connection/pins making poor contact. No codes? done a scan?
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Last edited by maxwedge; 06-01-2009 at 08:24 PM.
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#7
06-01-2009, 08:18 PM
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Re: 1988 Delta 88 rough idle
Not without checking components on site,there were 2 different icms in those years also. BTW AZ's test procedure for the icm's has proven to be about 50% accurate.
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