84 pick up webber carb missfires at full throttle
#1
84 pick up webber carb missfires at full throttle
I have been working on a truck i bought checked timing new plugs wires cap and rotor cleaned up carb and new gaskets changed in line plastic filter but I still missfires when I get about 3/4 throttle to w/of. I haven't got to the filter at the tank yet and I noticed front drive line had broken at sometime pinching the hard lines under the cab could that be my whole problem
#2
Registered User
IF (big IF) it is carb related did you adjust the float level while it was open? And, which Weber and is there a fuel pressure regulator going into it?
Also, which engine?
Also, which engine?
#3
It's a 22re no regulator yes floats were adjusted carbs 32/36 electric choke. I notice that the clear fuel filter only has maybe 1/8 inch of fuel at all times shouldn't it be full
#5
Registered User
The pinch at the steel line may be acting like a regulator.
On filters where I can see the fuel it usually seems to be 1/2 to 1/4 full when not running.
Also, beware of the clear glass filters, they look nice but the o-rings can deteriorate and cause problems (fire) - been there.
When you cleaned out the carb did you blow out ALL the jets and passages? Also, what was in the bowl when you opened it?
#6
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Join Date: Jul 2014
Location: West of DFW
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I would say it depends on how crunched the fuel lines are; it wouldn't be acting as a pressure regulator, but rather a flow regulator. If it can only manage to keep the fuel filter 1/8 full I'd either say the flattened lines are restricting flow or you have a weak fuel pump. Is the fuel filter before or after the fuel pump?
Last edited by ZXT; 01-04-2017 at 08:04 AM.
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#9
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Sounds to me like your best and cheapest bet is going to be getting a fuel pressure gauge on the line (close to carb). FPR and gauge combo would be best, but diagnosing what the problem is would be a lot easier if you knew what kind of pressure you were getting.
I have heard of people having their mechanical pumps loose pressure. They would still pump, but weren't up to the task when pressed.
I have heard of people having their mechanical pumps loose pressure. They would still pump, but weren't up to the task when pressed.
#10
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I would say it's the mechanical pump. They die from time to time, a lot more often than electric pumps. That would be a cheap place to start, but as Bingle said, a fuel pressure gauge wouldn't be a bad idea either.
#11
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#14
Yes Its a 84 truck that they put the re motor in with the webber and intake. I bought regulator and gauge new ngk iridium plugs and it fixed my backfire. Guess the plugs fouled do to excessive fuel still have a slight leak around carb base it runs a Lil ruff at cruising speed but overall it's much better
#15
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Yes Its a 84 truck that they put the re motor in with the webber and intake. I bought regulator and gauge new ngk iridium plugs and it fixed my backfire. Guess the plugs fouled do to excessive fuel still have a slight leak around carb base it runs a Lil ruff at cruising speed but overall it's much better
On a Weber you can over tighten things. The screws and any other screwed in part (jets etc.) should be snug but not heavily cranked down.
#16
Ten 4 ya I have a 1 peice adapter for carb to manifold the webber kit came with one base gasket so tried to reuse the one on the bottom but it's looking like I need to replace it i have the pressure set at 3.5 should I go down 2.5
#17
Registered User
3.5 is way too much - 2.5 max. Yes a new gasket. I always kept a spare carb kit around when I had a 32/36 they're not expensive.