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#1
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Need help with my zz502
My zz502 has me stumped. I had Eric rebuild the Holley and it performed excellent but it did not cure my problem. I then had F.A.S.T EFI installed (not cheap) and the issue is still present. The problem: it starts and runs fine from cold but after running up to temp and parking for a little while (20 - 30 minutes) it doesn’t want to start again and doesn’t want to idle. I have put in new plugs, ignition coil, plug wires and had the timing checked by the guy that installed the efi. What can cause this issue?
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Dave 1970 Monte Carlo SS |
#2
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Have you checked the wiring in the car? If it is old it may have a bad wire with a break or corroded inside the jacket. Heated up it expands and may be losing contact. Just throwing another possibility. You can check with a multi meter when cold then hot. My car did this with the starter wiring.
Scott
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69 Camaro RS/SS X22 4speed NOM but working on something special 69 Camaro x11 355 crossram m22 12 bolt 3.73's |
#3
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Also check the grounds.
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69 Camaro RS/SS X22 4speed NOM but working on something special 69 Camaro x11 355 crossram m22 12 bolt 3.73's |
#4
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Have you tried hot wiring it just to check the primary ignition wiring??
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You've never lived until you've almost died -- for those who fight for it, life has a flavor the protected will never know! |
#5
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Almost sounds like a heat soak problem with the carburetor and you might want to try a thicker heat-insulate gasket between the manifold and carb.
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1962 Biscayne O-21669 MKIV/M-22 1962 Bel Air Sport Coupe 409/1,000 |
#6
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What distributor?
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#7
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Ignition Module,, or if msd,,ignition box.
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69 Z28 Burgandy |
#8
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By the way this is in my 1966 Corvette. The Holley is no longer on the engine. It has FAST EFI now. I recently checked the ground strap from the engine to the front crossmember and cleaned the surfaces. I also installed a second ground strap on the other side of the engine to the frame rail (with cleaned surfaces).
The 502 has the HEI that came with the engine 12 years ago. I bought another new coil this past Saturday, installed it and it did not cure the problem. I do not know how to hotwire it but I will check the voltage when cold and hot. Thanks for the info.
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Dave 1970 Monte Carlo SS |
#9
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On the side of the HEI cap that holds the coil you will see connections (should be on the drivers side ... if someone has jacked with it) -- one is marked IGN ... run a hot wire from a good 12V source to there. OR hook up a volt meter to this IGN source and see if you have 12V with key in the ON position -- 12V during cranking ... TAZ
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You've never lived until you've almost died -- for those who fight for it, life has a flavor the protected will never know! |
#10
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Quote:
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Dave 1970 Monte Carlo SS |
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