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2000 safari awd chugging badly

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gary62
New User

Jul 18, 2011, 3:40 PM

Post #1 of 5 (1776 views)
2000 safari awd chugging badly Sign In
2000 gmc safari awd chugging badly, feels like you are driving over speed bumps, put in neutral it is fine, then back to drive fine for a while then back to chugging.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 18, 2011, 3:59 PM

Post #2 of 5 (1773 views)
Re: 2000 safari awd chugging badly Sign In
You could be having some misfiring going on. Is the check engine light on? If so, you might want to retrieve trouble codes for a starting point.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


gary62
New User

Jul 18, 2011, 4:04 PM

Post #3 of 5 (1769 views)
Re: 2000 safari awd chugging badly Sign In
no check engine light, changed the fuel filter, no change. We do have a pinhole leak in the rad, but i don't think this has anything to do with that.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 18, 2011, 4:43 PM

Post #4 of 5 (1763 views)
Re: 2000 safari awd chugging badly Sign In
Well if it is doing "skip to my lou", you need to figure out which cylinders are skipping. You may need to have someone put the engine under load (brake torquing) while you pull plug wires to see which cylinder(s) don't make a difference.

The fancy easy way of doing this is using a high end scan tool to monitor misfire counts or watching secondary patterns with a scope. Most DIY don't have that kind of equipment, so they are forced to use the old fashion way.

Most of the time, but not always, skipping under load is ignition related. Worn plug wires, weak coil, etc.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jul 18, 2011, 4:45 PM)


gary62
New User

Jul 18, 2011, 6:31 PM

Post #5 of 5 (1751 views)
Re: 2000 safari awd chugging badly Sign In
it has new plugs, wires, rotor cap and ignition coil, put in about 5 months ago.





 
 
 






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