'98 1500 5.2L no start, no spark, plugs dry
Hey all - have my ol' reliable '98 1500 4x4 5.2L I barely drive. Just use for Home Depot runs and construction errands around the house. Used it just a few weeks ago to put basement demo/debris in the bed to run to the dump but never got over there so I just parked it in the street with the bed full. Now we're expecting snow so I want to move it off the street and no start.
She cranks strong - good charge on the battery, etc. I put a timing light on the drivers side front plug wire - no flash while cranking. Tried another timing light. Same deal. Went to Autozone and grabbed a Duralast coil in a hail mary and replaced it - nada. Pulled passenger front spark plug - bone dry. It's low on fuel but ran fine last I shut it off and like I said I've got no spark. I do hear the fuel pump hum/buzz when I turn the key. Plug wires aren't in very bad shape. So considering I am not seeing spark based on timing light (two of them - doubt that the connection would be bad on both) and the #2 plug is bone dry, what could the culprit be? I had some cracked wiring at the PCM but I manage to tape it up and salvage it - it drove a few weeks ago but now won't start and hasn't moved since. I am not super familiar with these trucks - mine has been pretty damned reliable overall. Any thoughts are appreciated - going to have to try and push it into the driveway for now :( Oh one last thing - I put a cheap code reader I have on it - turned key to the run position and hit "READ" - no codes. Thanks all! |
I would suspect a bad crank sensor...... That would account for no spark/no fuel...... Does the fuel pump run while you are cranking the engine?
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Originally Posted by HeyYou
(Post 3382245)
I would suspect a bad crank sensor...... That would account for no spark/no fuel...... Does the fuel pump run while you are cranking the engine?
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Nope. Crank sensor tells the pcm the crank is turning. That information is used for ignition timing. Cam sensor (pick-up coil in distributor) is used for injector timing. But, if the PCM doesn't see the engine turning (via crank sensor), it won't fire the injectors either.
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Originally Posted by HeyYou
(Post 3382281)
Nope. Crank sensor tells the pcm the crank is turning. That information is used for ignition timing. Cam sensor (pick-up coil in distributor) is used for injector timing. But, if the PCM doesn't see the engine turning (via crank sensor), it won't fire the injectors either.
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Yep, Hall affect switch. It generates a square wave, I do believe...... at least, it is supposed to. :)
I am showing a violet/white wire as vref..... connector 1, pin 17. C1 is closest to the engine. |
https://cimg1.ibsrv.net/gimg/dodgefo...c88c547a1c.jpg
And... a few more... https://cimg6.ibsrv.net/gimg/dodgefo...25ce11653d.jpg They got me for 4 spark plug wires, the crank sensor... and something else - it's a grey connector near the drives side valve cover with 3 wires in a flat cable: https://cimg9.ibsrv.net/gimg/dodgefo...a0f6d13974.jpg Any help ID'ing that connector above? I was able to pull/cut the loom around the small chewed off section coming off the engine harness and I believe it's where the crank sensor pigtail should connect: https://cimg4.ibsrv.net/gimg/dodgefo...fc7f6cb113.jpg Now I have to figure out how to lengthen that and repair it. Sigh. |
Have you checked your relay fuse? I had the similar thing happen to me and after replacing the plugs,plug wires and tps I found out it was a relay fuse and my truck fired right up after I changed it
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Check the images above lol - no reason to check anything, I got rodent chew damage.
Anyone able to help with the purpose of that grey 3-wire flat cable connector in the third image? |
How about a shot a bit further away. I don't recognize that one at all....
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