89 misses/chugs/backfires - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-20-2006, 12:06 AM   #1
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Default 89 misses/chugs/backfires

The 89 will miss, chug, backfire (all of the above) when accelerating or going up any type of grade. Straight away or down hill 85 - 90 no problem. Plugs and wires replaced, 15K miles.
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Old 06-20-2006, 12:08 AM   #2
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Check engine light?
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Old 06-20-2006, 05:47 PM   #3
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Default 89 misses/chugs/backfires

no check engine light
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Old 06-20-2006, 05:54 PM   #4
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sounds like problem i had with MAF, but I had an intermittent SES light
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Old 06-21-2006, 12:11 PM   #5
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Check your PCV valve, IAT sensor, and MAF for carbon.

Other than plugs, what regular maintenance items have you had done in the past, say, two years?
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Old 06-21-2006, 12:14 PM   #6
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Off the wall question...what brands of plugs/wires did you drop on the car?
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Old 06-21-2006, 01:26 PM   #7
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Quote:
Originally Posted by BillBoost37
Off the wall question...what brands of plugs/wires did you drop on the car?
Was wondering the same thing

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Old 06-21-2006, 01:43 PM   #8
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For the fuel is it multi port or throttle body?
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Old 06-21-2006, 01:51 PM   #9
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Quote:
Originally Posted by Cheetah
For the fuel is it multi port or throttle body?
Huh?

The 87-05 Bonnies all used port fuel injection

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Old 06-21-2006, 11:25 PM   #10
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Default 89 - miss, chug, backfire or all

Plugs and wires - delco
fuel filter, pcv, and air filter - fram
15K miles
fuel pressure - 45 psi (never changes even when accelerated by hand)
no carbon build ups
check all sensor connections for corrosion
no check engine light
same problem with the engine hot or cold
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