Re: 95 T100 4.3L 4x4 questions...

Posted by 4Crawler on September 14, 2008 at 16:04:37:

In Reply to: 95 T100 4.3L 4x4 questions... posted by Ray Brown on September 13, 2008 at 13:44:39:

: I just picked up a 1995 T100 4x4 with the 4.3L V6. When I bought it it did have a bit of Pre-ignition (spark knock, dieseling) occuring. It also had a extremely cold A/C but needs the resitor pack for the HVAC Fan speed control. I just replaced all of the spark plugs, fuel filter, put a K&N Filter in it, cleaned the throttle body and MAF sensor, replaced the PCV valve and grommet, ran sea foam through the intake and in fuel tank along with injector cleaner, had the timing belt replaced, added water pump lube to antifreeze.

: The questions that I have are...
: 1. What else besides the plug coils and wire/boots could be causing the pre-ignition problem.
: 2. My A/C is now just warm and the prior owner had the A/C system recharged prior to sale. What could be causing this? I know tha the HVAC Fan only operates on High so the resistor pack probably needs replaced, unless the wire isulation is melted and then needs repaired/replaced.

: Any information that can be given to assist in the repair of the problems is greatly appreciated.

Must not be the stock engine (4.3 liter V6), or did you mean the 3.0 V6? Pre-ignition can be caused by carbon in the combustion chambers or may be a bad knock sensor that is what tells the ECU to back off the ignition timing is knocking is heard.

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• FYI Chad H 17:19:48 09/14/08 (0)

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Comments:
: : I just picked up a 1995 T100 4x4 with the 4.3L V6.  When I bought it it did have a bit of Pre-ignition (spark knock, dieseling) occuring. It also had a extremely cold A/C but needs the resitor pack for the HVAC Fan speed control.  I just replaced all of the spark plugs, fuel filter, put a K&N Filter in it, cleaned the throttle body and MAF sensor, replaced the PCV valve and grommet, ran sea foam through the intake and in fuel tank along with injector cleaner, had the timing belt replaced, added water pump lube to antifreeze.

: : The questions that I have are...
: : 1. What else besides the plug coils and wire/boots could be causing the pre-ignition problem.
: : 2. My A/C is now just warm and the prior owner had the A/C system recharged prior to sale.  What could be causing this?  I know tha the HVAC Fan only operates on High so the resistor pack probably needs replaced, unless the wire isulation is melted and then needs repaired/replaced.

: : Any information that can be given to assist in the repair of the problems is greatly appreciated.

: Must not be the stock engine (4.3 liter V6), or did you mean the 3.0 V6?  Pre-ignition can be caused by carbon in the combustion chambers or may be a bad knock sensor that is what tells the ECU to back off the ignition timing is knocking is heard.



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