Carb "Popping"
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Joined: Dec 2007
Posts: 19
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Carb "Popping"
Please HELP!!!
I have a question about a 1989 Jeep Grand wagoneer with the 360ci. V8.
I purchaced this Jeep not running, I first did a compression test-
-This is how the comperssion test went -
-1-98 2-110
-3-98 4-115
-5-110 6-120
-7-100 8-118
I replaced the fuel filter, fuel pump, plugs wires, cap, and roter.
After doing the tune up the Jeep cranked 5-6 times making a "fwooump"
sound on every revolution, then it fired up - hi idiling at about 2500RPM
- I kicked it down off high idle and it made a "snapping" noise through
the carbuerator - it then idled very rough and would not idle on it's own
- from then every time I would raise the RPM's it snapped like exhaust was
comming up through the carb (not like a carb backfire, very steady), upon
further inspection I found the plastic carb baseplate to be cracked, and the
gaskets were pushed out and leaking fuel. After researching carburators,
rebuild kits, etc. I decided to purchase a Edelbrok aluminum 4bbl intake
(non EGR) and a 600cfm Edelbrok 4bbl carb as a package, eleminating the egr and all smog accessories
thinking this would resolve the issue. It did not. The motor does run a lot
smoother but still has a miss and still snaps through the carb when raising
the RPM's.
My question is - what would this snapping noise through the carb be?
Iam under the impression that if the exhaust valves were hanging up,
there would not be any compression.
What am I missing?!
I do not think this an AMC specific problem so I am posting this on several different forums.
Thanks for any and all ideas...I'm ready to pull hair out!
I have a question about a 1989 Jeep Grand wagoneer with the 360ci. V8.
I purchaced this Jeep not running, I first did a compression test-
-This is how the comperssion test went -
-1-98 2-110
-3-98 4-115
-5-110 6-120
-7-100 8-118
I replaced the fuel filter, fuel pump, plugs wires, cap, and roter.
After doing the tune up the Jeep cranked 5-6 times making a "fwooump"
sound on every revolution, then it fired up - hi idiling at about 2500RPM
- I kicked it down off high idle and it made a "snapping" noise through
the carbuerator - it then idled very rough and would not idle on it's own
- from then every time I would raise the RPM's it snapped like exhaust was
comming up through the carb (not like a carb backfire, very steady), upon
further inspection I found the plastic carb baseplate to be cracked, and the
gaskets were pushed out and leaking fuel. After researching carburators,
rebuild kits, etc. I decided to purchase a Edelbrok aluminum 4bbl intake
(non EGR) and a 600cfm Edelbrok 4bbl carb as a package, eleminating the egr and all smog accessories
thinking this would resolve the issue. It did not. The motor does run a lot
smoother but still has a miss and still snaps through the carb when raising
the RPM's.
My question is - what would this snapping noise through the carb be?
Iam under the impression that if the exhaust valves were hanging up,
there would not be any compression.
What am I missing?!
I do not think this an AMC specific problem so I am posting this on several different forums.
Thanks for any and all ideas...I'm ready to pull hair out!
Record Breaker
Joined: Jul 2007
Posts: 2,040
Likes: 1
From:
RE: Carb "Popping"
moe in wichita ks
double check the spark plug wireing. check for vacuum leeks. check that there is a steel plate sandwitched between two gaskets under the carb. why? if the manifold is a spredbore style and the carb is a squarebore, and you only have one gasket,there will be acavity in the bottom of thecarb that is above a wall on the manifold when the gasket deforms it makes a vacuum leek. you HAVE to use Edelbrok gaskets and steel plate, the bottom gasket is not the same as most gaskets it must be made for the Edelbrokmanafold.
