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engine pinging

Sent to Car Experts August 14 03:07 PM

I have a 1994 crown victoria that has a pinging problem. it happens usually in real hot weather when the temp guage reads at the halfway mark and the speed is around 30 to 35 mph going up any slight grade putting a load on the engine. i can down shift it to stop the pinging but shouldn't have to. I use the recomended octane for the car and have tried a higher octane with no improvement. It does not seem to do this in cooler or rainy conditions. Have removed upper intake and removed a carbon builup at the egr valve. spark plugs have been replaced not long ago. It seems to me that some sensor in the sytem is not able to adjust the timing for the conditions when it is very hot.The engine never runs hot. The car runs great otherwise,lots of pep and idles very smoothe.

Edited by Customer (name blocked for privacy) on August 15 2006 at 5:36 PM

 

Optional Information:
1994 Ford crown victoria 4.6

Already Tried:
ford replaced egr pressure valve sensor ,replaced dpfe and cleanedegr ports last year then recently i removed the upper intake manifold and removed carbon build up at egr valve

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Reply
August 15 6:28 PM (1 day and 3 hours later)
         
Relist: No answer yet.
Customer (name blocked for privacy)
Answer
August 15 6:34 PM (6 minutes and 14 seconds later)
         
REPLIEDCheck Mark

Have you scanned computer if so what are the codes??

When work was done at Ford was it for the same problem??



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MechanicMan -- Master Auto Tech -- 98% Positive Feedback on 664 Car Accepts
Master Auto Technician 28yrs Electrical and Mechanical experience
Reply
August 15 10:53 PM (4 hours and 18 minutes and 34 seconds later)
         
Reply to MechanicMan's Post: no I have not scanned the computer. yes the work done at ford was for the same problem

Edited by Customer (name blocked for privacy) on August 15 2006 at 10:56 PM
Customer (name blocked for privacy)
Answer
August 16 11:16 AM (12 hours and 23 minutes and 22 seconds later)
         
ACCEPTEDCheck Mark

Hello

Next thing would be is to remove the octane adjustment bar this will retard timing 3 degrees, now test drive, also try removing the spout connector and look for rpm change.

The problem you are describing is call predetination, this is when the spark is happening earlier than needed.This can be caused by improper computer timing or excessive carbon build up in combustion chamber, this is cleaned by using a decarbonizing chemical introduced in to intake while running engine. Technician should know how to do this procedure.

I hope this helps, let me know



If this helps PLEASE hit the ACCEPT button and Please Give POSITIVE FEEDBACK!! BONUSES WELCOMED!Thanks
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MechanicMan -- Master Auto Tech -- 98% Positive Feedback on 664 Car Accepts
Master Auto Technician 28yrs Electrical and Mechanical experience
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August 16 12:17 PM (1 hour and 19 seconds later)
         
Reply to MechanicMan's Post: I am going to accept your answer. Now where is this octane adjustment bar located? What is the spout connector? Improper computer timing is fixed how? thanks for your help.
Customer (name blocked for privacy)
Answer
August 16 3:05 PM (2 hours and 48 minutes and 18 seconds later)
         
ACCEPTEDCheck Mark

Improper time usually computer, spout connetor usally near one of the coil packs in wiring harness, octane plug usually in wiring harness near firewall. Let me does some searching for pix no guarantee

And thank you



If this helps PLEASE hit the ACCEPT button and Please Give POSITIVE FEEDBACK!! BONUSES WELCOMED!Thanks
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MechanicMan -- Master Auto Tech -- 98% Positive Feedback on 664 Car Accepts
Master Auto Technician 28yrs Electrical and Mechanical experience
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