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engine stumble

Old 05-03-2018, 10:53 AM
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Join Date: Sep 2011
Posts: 121
Default engine stumble

ok this is what i just did today. did a compression test and leakdown plus oiled the cylinders to see if they rings or valves made low readings.
ohmed out the tps
voltage tested the map
so here is the dope.
compression throttle open and 6 hits on the gage did leak down dry 5 minutes ea.
1= 150 dry 165 wet
2=155 dry 140 wet do not understand that one did it wet 3 times and even got 120 once
3=150 dry 165 wet
4=140 dry 155 wet
ohmed the plug wires on the cap got meter at 20k
ohmed the tps 20k on the meter
top middle closed 1.01 open 3.76
middle bottom closed 3.62 open 0.91
top to bottom 4.47 closed and 0 open and all readings were smooth

tested teh map and got the right wire ground the middle i got 4.93 then connected the vacuum this is the readings voltage
0 v 4.93
5v 4.35
10v 4.32
15v 4.26
20v 4.21 all volts on the 20 volt scale so onthe youttube it looks like this is bad?

then i took off the pvc and it rattles so i puffed it and i could blow some before it closed and it allowed sucktion

one more thing the distributor i can move the rotor about 1 deg back and forth and that may be the bit of a movement i see when i measure the timing.

i took off the ecu connectors and checked them for corrosion i did not see any and then i greased them and reconnected them they snapped on firmly the wires did not look corroded or broken or frayed.

the spark plug change i did was not the fix, so i still have the problem

so anything else you guys can think of let me know. but i believe a map sensor is due for change. let me know if i'm wrong. thanks bp.

Last edited by corvairbob; 05-03-2018 at 11:23 AM.
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