Ford - Explorer :: 2000 - Misses / Bucks / Booms When Driving In Blowing Snow
Jan 21, 2011
2000 Explorer 4.0 SOHC, 138K miles on it. Runs like new. Except this butt problem since mid November 2010 (2 months) First time this happened it sounded like someone smacked the rear end with a 10 pound maul. BOOM! Was in blizzard conditions. Does it in AWD or 4WD. No tire slippage when it happened or happens. Only happens when:
1. Snowing good or in blowing snow from car ahead of me.
2. Not while accelerating or coasting.
3. In overdrive (not sure when in just third gear).
Had rear end inspected at Ford dealer and no issue was found. Complete driveline given clean bill of health. Dealer did PM of new lube and did the transfer case and front end at the same time as it was due anyway. After this, it usually (but not always) starts as an engine miss feeling and works it's way up to the sudden and violent "BOOM" and then a mixture. Anyway, did it again. Changed plug wires. Did it again. Tranny shop test drove while snowing - no root cause but certain it's not the tranny. Saw B1352 code and said take it to the dealer. Justanswer.com FORDEXPERT guy says B1352 is most likely the X-fer case shift motor. Inspected and replaced shift motor as it had signs of near death and on borrowed time. Did it again. Ford dealer Tech test drove while snowing and freaked out when BOOM happened. He's certain it's ignition. NO CODES!!!
Cylinder #3 (mostly) and cylinder #1 (little bit) showed slight ignition issues on diagnostics. Pinched clip in boot so they were tighter on plug and plugs were inspected OK. Sprayed water mist on coil and it's OK. Did it again. NO CODES!!! 70K on plugs so installed new plugs and second set of new plug wires thinking that RH tire is kicking snow on #1/2/3 plugs and causing short. Did it again. Tonight, when driving the last 10 miles in light snow with bucking 6 times, thinking it might be snow ingestion, I checked filter housing and I see just traces of snow in housing and snow packed into filter pleats at just one corner about 2" triangle. Still plenty of clean filter area I feel. (NAPA brand) filter is 6 months old and looks quite good. After reassembly, I feel around seam of housing and discover front seam not tight. Aha! Perhaps snow is getting into combustion chamber. Pushed in housing bottom and "thump" now it's tight and proper. Battery terminals tight and super clean. Dit it again but just once in 8 miles and was slight engine miss feeling - no buck or kick.
Other possibilities (I'm thinking):
Injectors?
main power to coil?
Is there are snow/dirt screen missing on tube into filter housing?
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Description: after 20-30 minutes (or miles) of driving I will begin to get hard bucks (misfires beyond one cylinder) and eventually stall. The car will typically turn right back over - but stall after only a minute or so. If I leave the car off for around 15 minutes it will run fine for a while and then stall out again.
It sounds as if the car is running out of fuel which it is not. The pump remains primed and the pressure is normal.
What I've done so far:
Fuel pump has been swapped
Fuel filter has been replaced
Fuel lines have been verified (even cleaned to rail - injector heads and intake manifold... It's been a fun weekend)
Fuel pump relay has been replaced
I have also recently replaced the ignition coil due to an unrelated issue for which I will provide detail so that you too can rule this out. I had random multiple misfires in bank 3 - replaced the coil and the misfires were gone. When the problem came back I was suspect of the new coil and originally believed that this had failed at temp. This coil has been tested hot and cold and passed each way. I also swapped out for the coil with the issue on bank 3 just to verify.
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Can I do anything to solve this, other than manually shift to the low range?
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