1991 Chevrolet Caprice engine cuts out

JORGY

MEMBER
1991 CHEVROLET CAPRICE
5.0L
V8
RWD
AUTOMATIC
74,500 MILES

Engine cuts out at 40-55 mph under slight accerlation especially going up a hill or incline. New plugs & wires
new ignition module new map sensor. Cap & rotor & coil are good. Cuts out for a second then goes again
will do this 3 or 4 times when under a load as described. Fuel pump is good. Any ideas or advice? Thank you

5 Replies

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

Does this only happen when the engine is warm?

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Thursday, August 21st, 2014 AT 6:05 PM

JORGY

MEMBER
3 POSTS

Yes only when warmed up good

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Thursday, August 21st, 2014 AT 6:32 PM

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

This is from experience only, but I suspect the crank sensor is bad. I have seen them crack. When the engine is cold, everything is fine. When the heat up, the sensor housing will expand causing misfires. Engine shut down.

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Thursday, August 21st, 2014 AT 6:34 PM

JORGY

MEMBER
3 POSTS

The motor will keep running but will cut out for a second or two. Acts just like somebody turned off the key.

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Thursday, August 21st, 2014 AT 6:40 PM

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

I feel that is the issue, but I can't be 100% sure without checking the crankshaft signal when it is happening. If you know someone that can do that, have it done. My believe is the signal will be lost for a second or two when the miss happens.