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Backfiring through the manifold

Tiny
GINA SIMMONDS
  • MEMBER
  • 1999 DODGE CARAVAN
  • 3.8L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 156,000 MILES
Changed spark plugs and wires van ran great for two days. Got fuel as I left the station car bogged down and began to backfire through the manifold upon acceleration. Only so far we have changed the fuel pump and filter assembly the coolant sensor the thermostat because it broke and the TPS. We have used two cans of sea foam with no change. We have checked all vacuum lines twice this van does not have a MAF and are getting ready to redo the spark plugs to look for charing. Any thoughts or help will be very very much appreciated. Running out of money and Ideas. Lol. Thank you
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Friday, May 26th, 2017 AT 6:08 PM

3 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
A clogged EGR valve can cause some vehicles to run like that. I would suggest pulling it and cleaning it with some carburetor cleaner and making sure that the port it is bolted in to is also clean. If that does not work, have the timing and fuel pressure checked (some after market fuel pumps are junk and come out of the box already weak).
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Friday, May 26th, 2017 AT 7:12 PM
Tiny
GINA SIMMONDS
  • MEMBER
  • 4 POSTS
Here is something we would NEVER have guessed we found a white Sand/salt/sugar in the tank see pictures there was alot of it not sure what is actually was but my husband said it tasted sweet yes he tasted it curiosity I guess we had to get another fuel pump because the pressure was below 50 I will update when the van is back together
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Sunday, May 28th, 2017 AT 12:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
O man, good find on that one. Please let us know when you have it back together.

Cheers, Ken
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Wednesday, May 31st, 2017 AT 1:38 PM

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