engine stalls when decelerating while towing
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engine stalls when decelerating while towing
I had this new minor issue pop up while towing my 10Klb travel trailer this weekend. Whenever I am decelerating down a hill and the speed drops from over 40MPH to 35MPH the engine will stall right at 35MPH. Doesn't do this when not towing. If I blip the throttle right before 35MPH it will idle fine. Engine starts right back up. Truck is an almost stock early 99 with an automatic transmission. Any ideas?
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Never stalled any other time. I considered the CPS and I have a spare so I might swap that out anyway. It is very predictable over a 300+ mile trip it happened 6 times and always right at 35MPH while decelerating down a hill from a faster speed. Once I figured this out I was able to prevent it by blipping the throttle before I reached 35MPH and then it would drop to an idle. Thanks for your input!
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Fixed. I pulled the motor to replaced my #5 piston that had a hole burnt in it, and replaced the CPS. Not sure if it was a connection problem corrected during the engine removal/install or the CPS, but I just pulled my trailer 150 miles and had zero problems. Thanks guys. 
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Fixed. I pulled the motor to replaced my #5 piston that had a hole burnt in it, and replaced the CPS. Not sure if it was a connection problem corrected during the engine removal/install or the CPS, but I just pulled my trailer 150 miles and had zero problems. Thanks guys.
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I put over 10K miles on the truck with a bad piston, (had no compression on #5) that didn't change. The stalling was a new problem. It was wierd because it only ever happened while pulling my camper, and it happened EVERYTIME I decelerated through ~37MPH with the camper attached. ~37MPH is where the transmission downshifts, but no longer stalls... I now pulled the camper a total of 400 miles and no issues, next trip is in a few weeks.
I didn't realize you could replace the CPS w/o removing the motor. Good to know for next time
edit: I just realized I never mentioned the no compression on #5 in my first post, sorry about that!
I didn't realize you could replace the CPS w/o removing the motor. Good to know for next time
edit: I just realized I never mentioned the no compression on #5 in my first post, sorry about that!
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