 Sputering and Backfire when warmed up... Help! |
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| WolfR32 |
 May 29 2008, 10:15 AM
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#1
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Newbie  Group: Members Posts: 47 Joined: 19-September 07 From: Newbury Park, CA Member No.: 8,130 Region Association: Southern California  |
So I have been having what seems to be a cylinder not firing when my 74 2.0 warms up and under load. We thought it was the FI so put Webbers on, but it is still doing it... going for the coil next.
Any thoughts? Thanks! |
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| rhodyguy |
May 29 2008, 10:38 AM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,092 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
what size of carbs? to include all jetting and venturi sizes. bone stock 2.0 other than induction, dist, and fuel pump? check timing, check valves, check for vaccum leaks. ensure equal carb flow with your synchronometer.
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| WolfR32 |
May 29 2008, 10:45 AM
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#3
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Newbie Group: Members Posts: 47 Joined: 19-September 07 From: Newbury Park, CA Member No.: 8,130 Region Association: Southern California |
The carbs are 40. But this was happening before I went to carbs… I took it in for a check up after I bought it and that is when the trouble started. I drove it back from San Fran with no problems…
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| purple |
May 29 2008, 10:58 AM
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#4
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Pigeon feeders attract me Group: Members Posts: 938 Joined: 24-July 07 From: Houston, TX Member No.: 7,942 Region Association: None |
You NEED to put post specifically what's in your carbs, otherwise we cant help you. Also, are your valve adjusted, timing correct, good fuel pressure? Carb float level?
for example: MAIN:1.30 IDLE: .55 AIR: 200 VENT: 28 That's what my weber 40's are. They do the same thing yours do, pop and crack and backfire. |
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| rhodyguy |
May 29 2008, 11:10 AM
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#5
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,092 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
and you car should not backfire, sneeze back thru the carbs, whatever. nor should it go on it's nose when you give it the gas.
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| TheCabinetmaker |
May 29 2008, 04:42 PM
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#6
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I drive my car everyday Group: Members Posts: 8,304 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
QUOTE(WolfR32 @ May 29 2008, 11:45 AM)  The carbs are 40. But this was happening before I went to carbs… I took it in for a check up after I bought it and that is when the trouble started. I drove it back from San Fran with no problems… Maybe your "check up" guy did something or unplugged something. |
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| Heeltoe914 |
May 29 2008, 05:02 PM
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#7
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Senior Member Group: Members Posts: 1,135 Joined: 31-January 06 From: Tujunga Calif, Member No.: 5,506 |
Check Vavles as well.
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| rhodyguy |
May 29 2008, 05:40 PM
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#8
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,092 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
did you keep all of the fuel injection equipment?
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| Zardozz |
May 29 2008, 06:22 PM
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#9
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Member Group: Members Posts: 107 Joined: 31-March 08 From: Orange County, CA Member No.: 8,874 Region Association: None |
I had some backfire/pop-spit issues on my teener and I thought it was a prob with the turbo/carb/jetting. Turned out to be a bad spark plug.
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