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I have a 1987 S15 GMC Sierra V6 2.8L. I have spark and gas but no start. Any ideas? Truck was running fine, sat overnight, no start in the morning.

Replaced distributor cap and rotor exactly location.

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  • TnSquatch Mar 10, 2019

    Are the points opening and closing when you turn the engine over? Is the point gap correct?
    Check the timing too. It could have jumped time. If the timing chain slips only a couple teeth, your engine will not start.

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Check the points....make sure the gap is correct with a feeler guage. If you don't have a feeler guage, you can get close by using a matchbook cover as a guage. Also, check the engines timing. It could be that it jumped time....if the timing chain slips just a couple teeth, your engine will not start.

Posted on Mar 10, 2019

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  • GMC Master
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How good is the compression ?

Posted on Mar 10, 2019

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Posted on Jan 02, 2017

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SOURCE: s10 pickup after warming up truck starts missing

You might have computer problems.

Does the check engine light come on when it starts to miss?


Posted on Nov 30, 2008

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SOURCE: 96 gmc sierra hard to crank after 12-14 hours

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator

Posted on Jul 14, 2009

Gort007
  • 1187 Answers

SOURCE: ROTOR BURNING UP

The rotor is somehow making direct contact with one or more distributor contacts.

Check the contacts inthe cap to see if you find any physical damage to one or more contacts caused by the rotor.

Could be rotor lead too long (file it down) or maybe the distributor shaft is bent or not seated. Remove cap and observe the distributor shaft as someone cranks the engine. Does it wobble? Can't tell? Place a stiff reference parallel to the shaft and turn engine again.

Posted on Oct 07, 2009

  • 491 Answers

SOURCE: replaced rotor and distributor cap and truck was

sounds like you have the plug wires on the cap mixed up. reccomend recheck the order and make sure they are in the right order

Posted on Oct 12, 2009

  • 5 Answers

SOURCE: 1987 GMC Jimmy Distributor cap and Rotor replacement

To replace the Distibutor cap and Rotor [they fit together as a unit when you get the two parts together]. First you need to mark with masking tape [or other such tape you can write on] the number of each spark plug wire and attach the tape firmly to each wire. DO NOT make any mistakes! Make sure you are numbering each wire with it's correct number based on the spark plug w/ wires position! Depending on if you have a 4,6 or 8 cylinder vehicle you will have 4,6, or 8 spark plug wires/spark plugs, and each has it's own number. You'll need to find out which is the number one plug ,number two plug, number three plug until you correctly number each one! You will end up with wires [either 4,6 or 8] going around the Distributor Cap. The one in the middle of the cap is the "COIL WIRE" leave this one unmarked cause you'll know that one stays in the middle. NOTICE- YOU need to positively find out which plug is which number with a VEHICLE MANUAL that shows you clear photos/diagrams of which plug/wire is which and i'ts position on the cap. Once you ID each wire then you need to mark your new DISTRIBUTOR CAP with the exact numbers in the exact place as the wire was.Now you can remove the wires off the old distributor cap and remove the cap and old ROTOR. Put the new ROTOR in. Place the CAP in the correct position as before and place the NEW Spark Plug Wires in there correct places based on the number you put on your New Distributor Cap.

Posted on Jul 13, 2012

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