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Engine missing under load
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fdakin
Novice
Aug 23, 2010, 1:27 PM
Post #1 of 9
(2338 views)
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Engine missing under load
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1998 buick skylark 3.1..Engine feels like a dead miss. Not a Slite miss.Only does it when the A/C is on and under a load. I started out with basic tune up. Plugs,wires, And after I replaced the plugs again thinking I might have broken one. checked all over for vacume leaks. Found none. I put on a modual and Coil packs off of an other car and they omh. out the same.Today I took off the fuel rail and chaged the two injector that red the lowest reading. I cant figure this thing out.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2010, 1:38 PM
Post #2 of 9
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Re: Engine missing under load
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You must have a check engine light on. What codes is it storing?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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fdakin
Novice
Aug 23, 2010, 1:41 PM
Post #3 of 9
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Re: Engine missing under load
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It is throwing a MAP sencor code And I did check the voltage. With the ingine running the voltage was 1.9
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2010, 1:43 PM
Post #4 of 9
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Re: Engine missing under load
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What was the exact code number. Did you try apply vacuum to it to see what range it has?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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fdakin
Novice
Aug 23, 2010, 1:49 PM
Post #5 of 9
(2319 views)
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Re: Engine missing under load
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No I didnt I dont have a vacume gauge But it does have good vac. Or at least it feels good. Can I test it with engine vac.?
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fdakin
Novice
Aug 23, 2010, 2:25 PM
Post #6 of 9
(2301 views)
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Re: Engine missing under load
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any more ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2010, 2:31 PM
Post #7 of 9
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Re: Engine missing under load
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I'm not out of ideas, Your out of tools.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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fdakin
Novice
Aug 23, 2010, 2:57 PM
Post #8 of 9
(2292 views)
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Re: Engine missing under load
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Got a pump...what am I looking for?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2010, 3:01 PM
Post #9 of 9
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Re: Engine missing under load
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With the key on, a digital voltmeter attached to the signal return wire and the MAP sensor plugged in, slowly apply vacuum to it. You should see a slow steady climb to or decrease from about .5v on up to about 4.5v with no glitches in between.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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