Thanks to all of you for the replies! Shadow 11.did you post the reply at 3 or 4 in the morning? Up late, or up early? Regardless, thanks for the detailed response!ĬanaTurbo.I swapped rotors with my late '67, but made no difference. Any ideas as to what I should check next? In summary, have spark, but won't start even with starter fluid. Usually, if there's a fuel issue, car will run with starter fluid, then die as soon as you stop spraying. With a helper turning the key, I couldn't get it to run under the influence of starting fluid. Removed the air cleaner hose at the intake manifold, Choke looks normal (closed). That "B" side bank is a real bear! Still won't fire. 025, upon recommendation of the local R-R guru. Dimmer flashing on a plug wire, so out of caution, replaced the plugs with Champion RN12YC, gapped at. ![]() Healthy flashing on the tester, touching the coil wire to distributor. Checked for spark with my Champion Spark Tester pen. Presently, half a tank of gas, fuel pump acts normal. Points were installed prior to the brunch, and ran fine, so timing isn't an issue. Went to return the car yesterday and couldn't get it to fire. Garaged it upon returning home (so moisture isn't a factor). Ran great, avg'd about 11.5 mpg for the 160 mile trip at interstate speeds. There, they're really gonna' stick it to you at around $280 to $300 (US).Strange situation: Drove a friend's early '67 Shadow to a RROC brunch about a month ago. The fuel pumps that are used in all of the GM Vortec equipped vehicles are expensive, especially if you buy them at your local auto parts store. Seconds after the engine starts YES Where To Buy The Fuel Pump And Save $$$ W/ fuel pressure gauge) YES PCM disables fuel injectors a few I've created the following chart to help you tell the difference between the two so that you can find out which one is the one causing your pickup (or SUV) not to start (since PassLock failures (activations) and bad fuel pumps are a very common problem): Bad Fuel Pump to PassLock Activation Relationship Symptom PassLock Fuel Pump Engine cranks but won't start YES YES Engine starts with starting fluid (momentarily) YES YES Ignition system delivers spark YES YES Passlock MIL flashes on instrument cluster YES Engine starts momentarily then stalls YES Fuel pressure at spec (as checked If you then spray carburetor cleaner or starting fluid into the intake, the engine starts (although momentarily because the engine will stall again as soon as the starting fluid -or carb spray- you sprayed into the throttle body gets consumed).īecause this behavior mimics a failed fuel pump, it unfortunately leads a lot of folks to believe that the fuel pump has failed (when it hasn't). This is due to the fact that when the Passlock system arms itself on your GM pickup or SUV, the engine will crank but won't start, since the PCM has disabled the fuel injectors. One of the things that can have you replacing a good fuel pump is an anti-theft system (PassLock) failure. Difference Between A Bad Fuel Pump And An Anti-Theft System (PassLock) Failure The next step is to confirm the exact fuel pressure with a fuel pressure gauge to be absolutely sure. ![]() ![]() This confirms that the fuel pump is starting to fail. The following tutorial may be of help: How To Troubleshoot A No Start (GM 4.3L, 5.0L, 5.7L).ĬASE 3: The engine started and stayed running.Verify that the ignition system is creating and delivering spark to all cylinders. ![]()
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