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intermittent problem 1989 Buick
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granpabobby
New User
Jul 21, 2011, 8:26 PM
Post #1 of 6
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intermittent problem 1989 Buick
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1989
Buick
Regal
3.1 V6
unknown
problem..intermittent no start
no spark- no fuel in the run /crank mode
replaced : ignition module ,ECM ignition switch module and crankshaft position sensor
The motor failed to start completly..replaced the crank sensor and it ran for 2 days..then intermittent problem came back..
fuel pump tests good w/ 40 psi and good fuel flow through my tester
could the new crank sensor be defective ?
or could be something else ?
new relays ..all fuses checked
Now showing code 25..MAT too low..can not find a MAT sensor..is it part of the MAP sensor ?
Vacume is 20 inches and steady
(This post was edited by granpabobby on Jul 22, 2011, 6:41 PM)
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granpabobby
New User
Jul 23, 2011, 5:30 PM
Post #2 of 6
(3103 views)
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Re: intermittent problem 1989 Buick
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The crank sensor is in the block
no sensor on the balancer
shows code 23 MAT is low
There is no MAT sensor could it mean the IAT ?
Spotted a ground wire off near the crank sensor..wire has been off for a long time ..it bolts to the block but the bolt is gone..will have to find another bolt
Any idea what this ground is for ?
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Sidom
Veteran
/ Moderator
Jul 23, 2011, 5:49 PM
Post #3 of 6
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Re: intermittent problem 1989 Buick
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They're basically the same thing......The temp of the intake air.....
You may want to trace that one down.....
Also trace down the harnesses of the crank sensor....... I've seen some get oil saturated that eats off the insulation of the wires, they intermittently touch together causing some problems... Also make sure none of the other harnesses are rubbing thru anywhere or got up against something hot (EGR tube) & melted.....
Definitely clean & reattach that ground wire....
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granpabobby
New User
Jul 24, 2011, 4:24 PM
Post #4 of 6
(3093 views)
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Re: intermittent problem 1989 Buick
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Beware the crank sensors on these Buick 3.1
Mine was cracked all the way around..they can break off in the block
My old one failed completly and almost broke in two takeing it out .
Will reattach the ground in the mourning when the motor is cold .
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Sidom
Veteran
/ Moderator
Jul 31, 2011, 2:38 PM
Post #6 of 6
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Re: intermittent problem 1989 Buick
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Glad to hear you got it going...... I hate tracing down shorts. Those can be the biggest PITAs to find..
Sounds like the insulation on one of the wires was touching your ground wire giving you problems......
While not a huge deal that wire is there to shield out interference. Getting some bleed over from the secondary ign or other source can really reek havoc on that signal & cause some weird running problems of it's own.
But good job on tracing down the short and taking the time to let us know what the fix was.......
Those really do take a lot of patience (more than I have some of the times... ).....
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