Engine backfire
#11
Guest
Posts: n/a
Re: Engine backfire
As Paul said you have oxygen in the exhaust, common on SMOG engines
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#12
Guest
Posts: n/a
Re: Engine backfire
As Paul said you have oxygen in the exhaust, common on SMOG engines
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#13
Guest
Posts: n/a
Re: Engine backfire
As Paul said you have oxygen in the exhaust, common on SMOG engines
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
with an air pump, but an injected engine shouldn't have one to pass
SMOG. Do you have one anyway carried over from an old AMC engine? Or you
have an exhaust header leak that needs to be fixed.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#14
Guest
Posts: n/a
Re: Engine backfire
<ezeppelin@msn.com> wrote in message
news:fa415237.0402171619.552c2597@posting.google.c om...
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Could be:
Exhaust leak
Burnt or leaky exhaust valve
Retarded ignition timing and/or rich fuel mixture
Some engines also have a dashpot type device to prevent the throttle from
slamming shut when decelerating. This will also prevent this if the other
conditions don't exist.
Chris
#15
Guest
Posts: n/a
Re: Engine backfire
<ezeppelin@msn.com> wrote in message
news:fa415237.0402171619.552c2597@posting.google.c om...
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Could be:
Exhaust leak
Burnt or leaky exhaust valve
Retarded ignition timing and/or rich fuel mixture
Some engines also have a dashpot type device to prevent the throttle from
slamming shut when decelerating. This will also prevent this if the other
conditions don't exist.
Chris
#16
Guest
Posts: n/a
Re: Engine backfire
<ezeppelin@msn.com> wrote in message
news:fa415237.0402171619.552c2597@posting.google.c om...
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Could be:
Exhaust leak
Burnt or leaky exhaust valve
Retarded ignition timing and/or rich fuel mixture
Some engines also have a dashpot type device to prevent the throttle from
slamming shut when decelerating. This will also prevent this if the other
conditions don't exist.
Chris
#17
Guest
Posts: n/a
Re: Engine backfire
What engine and what Jeep?
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#18
Guest
Posts: n/a
Re: Engine backfire
What engine and what Jeep?
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#19
Guest
Posts: n/a
Re: Engine backfire
What engine and what Jeep?
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
Some GM engines have quirks....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
"ezeppelin@msn.com" wrote:
>
> What are the most common causes and remedies for engine backfire?
>
> (At least, I think backfire is the correct term for my problem... it
> is an occasional loud 'bang' as if from gunfire, which seems to
> emanate from near the catalytic converters under my floorboard rather
> than up in the engine compartment.)
>
> Anyway, assuming that I am using the correct term... I have a jeep
> with a fuel injected chevy engine, and it backfires from time to
> time. Every occurence is when the engine is revving down (e.g., I put
> the clutch in.) However, beyond that, there is no rhyme or reason...
> sometimes it will happen 3 times in an hour, other times it might go
> weeks with no backfire. I can't detect any other common factor
> besides revving down (e.g., it happens regardless of whether the
> engine is hot or cold, what gas I'm running, etc.)
#20
Guest
Posts: n/a
Re: Engine backfire
OP said "injected chevy" I think you could bet the farm that it's a
stock 350".
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mike Romain wrote:
>
> What engine and what Jeep?
>
> Some GM engines have quirks....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
stock 350".
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mike Romain wrote:
>
> What engine and what Jeep?
>
> Some GM engines have quirks....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's