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09-06-2004, 06:22 PM
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#1 |
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Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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need help
I have a 69 with a strt 6. Problem is when it warms up it seems to run rough. If I get it on the highway and drive about 20 minutes it will die when I pull off to exit. Otherwise the truck runs great. The engine was rebuilt about a year and half ago. What's up?
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09-06-2004, 06:36 PM
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#2 |
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Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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Next time it does it see if you're getting ignition, if not your coil is probaby the culprit. If spark is ok, maybe it's vapor-locking.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
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09-06-2004, 06:41 PM
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#3 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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maybe....
remove air cleaner.....be careful....while running place hand over the top of carb....to limit the air intake....not covering completly....
if it idle's up...you got a vacuum leak....... could be that while cold choke is on.....running richer....after warm...no more choke....thus leaner mixture.....engine no likey....  just a thought..... your pal....mark 
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09-06-2004, 06:42 PM
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#4 |
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Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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If its vapor locking what would I do. The coil is a petronix and isn't all that old but I'll keep that in mind. Anything else you can think of?
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09-06-2004, 06:45 PM
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#5 |
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Registered User
Join Date: Jun 2002
Location: Fort Worth, TX
Posts: 920
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This truck still has the original manual choke.
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09-06-2004, 06:52 PM
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#6 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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may still have a vacuum leak....
 try the hand...over the carb....trick...can also spray carb. cleaner around the lower carb. base and manifold while running to check throttle plate rod seals and base gasket..and intake to head gasket.... |
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09-06-2004, 09:47 PM
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#7 |
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Who me?
Join Date: Jun 2004
Location: Bothell WA
Posts: 640
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My vote, the coil is the culprit. In my experience when they are about to give up the ghost they tend to malfunction when they warm up.
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Living the dream  72 2WD Blazer, under going porter built surgery 67 GT Mustang fastback 67 Mustang coupe C/S clone 64 Falcon sprint hardtop |
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09-07-2004, 06:58 AM
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#8 |
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1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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I've had that happen too, they get "funny" when they get warm. Mine used to be hard starting when hot, acted like it was flooded but it wasn't. Turned out to be either the coil or the module going bad. (not sure which it was since I replaced both at that same time)
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 Last edited by bobs409; 09-07-2004 at 07:01 AM. |
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