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post #1 of (permalink) Old 04-01-2001, 04:59 PM
BigAl
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Will not start

I started my truck and noticed immediately that it was running rough...no power, sounded like it wasn't hitting on all 6 cylinders, I was able to drive it though and it seemed to top out @ 2000rpms. The next day, same thing...then it wouldn't start at all. Apparently the fuel pressure is good, I am getting a spark, yet it will not start. I even tried to use ether and it wouldn't start. I heard that maybe the timing chain jumped or maybe it is a sensor. Anyone have an answer? Thanks in advance....

Al [img]/wwwthreads_images/icons/smile.gif[/img]

'87 Jimmy 4X4 2.8L [img]/wwwthreads_images/icons/crazy.gif[/img]
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post #2 of (permalink) Old 04-01-2001, 05:18 PM
 
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Re: Will not start

<font face="Comic Sans MS">Change the fuel filter, pull a fuel line off and see what sort of volume the pump is putting out (it might be able to build up decent pressure but not have enough volume to operate).

Mark the distributor cap base where the #1 plug wire terminal is, pull the distributor cap. Now turn the engine over until you get top dead center on #1 cylinder (you can pull the spark plug on that cylinder and hold your finger over it and when you feel pressure build up you know you've got compression stroke, then rotate the engine a bit more until the timing mark aligns with where your timing is set at. Does the rotor now point at the mark indicating where #1 terminal is? If it does, then the timing chain is likely still good...

Try the cheap stuff first... </font>

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post #3 of (permalink) Old 04-01-2001, 07:08 PM
 
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Re: Will not start

Do you have a amp/aftermarket stereo? Check your connections to your battery. I had a week connection and it would run just very poor. Just a thought.

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post #4 of (permalink) Old 04-02-2001, 08:39 AM
 
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Re: Will not start

If it will crank and not turn over completely then I would check the coil. Had that happen to me recently on my '98 and thought it was the fuel pump... Turned out only to be the coil. Fixed it right up!

J.R. [img]/wwwthreads_images/icons/cool.gif[/img]

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post #5 of (permalink) Old 04-04-2001, 07:58 AM
BigAl
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Re: Will not start

Turned out to be several vacuum leaks to the MAP sensor and other areas. Time to change all questionable vacuum lines!

Al [img]/wwwthreads_images/icons/smile.gif[/img]

'87 Jimmy 4X4 2.8L [img]/wwwthreads_images/icons/crazy.gif[/img]
post #6 of (permalink) Old 04-04-2001, 09:17 PM
 
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Re: Will not start

Yes, vacuum lines are critical for a 2.8 to run at its peak performance (such as it is). I'm constantly checking my lines on my 2.8 engined (Rochester 2SE carbureted) 1986 Jeep Cherokee.[img]/wwwthreads_images/icons/smile.gif[/img]

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