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Newby Memphis area.. Eric great videos.
Short story 2000 Chevy WT 4.3L crank but no start Seems to turn over normally. Fuel pressure about 65 ( newer pump) starting fluid still nothing, no spark. at coil with jumper wire replacing coil wire, strong bat voltage on one terminal, pulsating voltage negative side with test light. Seems like ignition coil so I ignored my golden rule (its not the coil) and replaced coil with a new one anyway. still no spark..When cranking I don’t see a tach reading at the cluster. Hooked up scanner and I can see starting RPM in data stream, 2 unrelated (old) lean bank codes, Nothing else. Pulled cap and don’t see anything weird with the distributor. I’m very familiar with cross fire cap issues Trying not to just throw parts at it.
I’m leaning towards a crank or cam position sensor or possibly a wiring harness problem. I think the ECM RPM/tach reading is from the crank sensor, right? Would a dead camshaft sensor prevent startup? ITs strange to me that I’m getting good bat and pulsating negative at coil but still no spark.
I would really appreciate some help on this. Marshall..
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I just pulled the cap again to insure rotor spinning and the timing chain is ok. wiggle test unplug and plug everything.
A bad cam sensor will prevent start. And, in my experience, without throwing a code. Testing the cam and crank sensors may be a good idea.
I really appreciate the help on this.. I found a entry in the Factory service manual stating the cam position sensor would not prevent start up, but would affect how the computer fires the injectors Each bank vs. each injector.. So If I’m getting a RPM signal at the ECU. I’m thinking either the crank or the cam position sensor is probably not the issue. I’m leaning more towards the coil driver now.. What do you think?
[quote=”RED7218″ post=191293]Newby Memphis area.. Eric great videos.
Short story 2000 Chevy WT 4.3L crank but no start Seems to turn over normally. Fuel pressure about 65 ( newer pump) starting fluid still nothing, no spark. at coil with jumper wire replacing coil wire, strong bat voltage on one terminal, pulsating voltage negative side with test light. Seems like ignition coil so I ignored my golden rule (its not the coil) and replaced coil with a new one anyway. still no spark..When cranking I don’t see a tach reading at the cluster. Hooked up scanner and I can see starting RPM in data stream, 2 unrelated (old) lean bank codes, Nothing else. Pulled cap and don’t see anything weird with the distributor. I’m very familiar with cross fire cap issues Trying not to just throw parts at it.
I’m leaning towards a crank or cam position sensor or possibly a wiring harness problem. I think the ECM RPM/tach reading is from the crank sensor, right? Would a dead camshaft sensor prevent startup? ITs strange to me that I’m getting good bat and pulsating negative at coil but still no spark.
I would really appreciate some help on this. Marshall..[/quote]Have you tested the ignition control module next to the coil? If that tests good, the only thing that I can think of is the pick up in the distributor or a worn distributor gear.
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[quote=”redfury” post=191315][quote=”RED7218″ post=191293]Newby Memphis area.. Eric great videos.
Short story 2000 Chevy WT 4.3L crank but no start Seems to turn over normally. Fuel pressure about 65 ( newer pump) starting fluid still nothing, no spark. at coil with jumper wire replacing coil wire, strong bat voltage on one terminal, pulsating voltage negative side with test light. Seems like ignition coil so I ignored my golden rule (its not the coil) and replaced coil with a new one anyway. still no spark..When cranking I don’t see a tach reading at the cluster. Hooked up scanner and I can see starting RPM in data stream, 2 unrelated (old) lean bank codes, Nothing else. Pulled cap and don’t see anything weird with the distributor. I’m very familiar with cross fire cap issues Trying not to just throw parts at it.
I’m leaning towards a crank or cam position sensor or possibly a wiring harness problem. I think the ECM RPM/tach reading is from the crank sensor, right? Would a dead camshaft sensor prevent startup? ITs strange to me that I’m getting good bat and pulsating negative at coil but still no spark.
I would really appreciate some help on this. Marshall..[/quote]Have you tested the ignition control module next to the coil? If that tests good, the only thing that I can think of is the pick up in the distributor or a worn distributor gear.
Sent from my SM-J327P using Tapatalk[/quote]Apparently I’m a day late and a doll hair short.
Sent from my SM-J327P using Tapatalk
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