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My 87 4.3 check engine light comes on when stopping at a light or slowing down to 10 mph or so. Stays on for 30 sec. +/- then goes off till another speed up then slow down. It does have a ruff idle at slow RPM. Doesn't stay on long enough to have it checked.
Any helpful hints of what it might be.
 

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Deputy Director, Region 3 PA (west)
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Check it anyway. The old OBDI systems stored a code in memory for 49 restarts until they self-cleared. You can check codes yourself with a paper clip. Search this site for directions and a code listing.

Bill
 

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Deputy Director Region 6 - Supporting Member
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welcome Don
you'll have to check the codes with the engine running.. those soft codes are hard to catch..

you might check all the vacuum lines, see if there is any leaks..
check all the connectors/connections..

:texas:
X2 My first thought when looking at this was vacuum leak :dontknow:.
 

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My 87 4.3 check engine light comes on when stopping at a light or slowing down to 10 mph or so. Stays on for 30 sec. +/- then goes off till another speed up then slow down. It does have a ruff idle at slow RPM. Doesn't stay on long enough to have it checked.
Any helpful hints of what it might be.
Any luck?
 
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