Chevy
Not firing. replaced crank and cam sensor still not firing, no. started fine. moved it to mow. wont start back, 2000 gmc
Expert's Assistant chat
Customer: not firing. replaced crank and cam sensor still not firing
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: no. started fine. moved it to mow. wont start back
JA: What is the model/year of your Chevy?
Customer: 2000 gmc 6500 series 8.4 liter
JA: Are you fixing your 2500 yourself? What have you tried so far?
Customer: yes. new crank and cam sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: fuel presure is 60 psi
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: no. started fine. moved it to mow. wont start back
JA: What is the model/year of your Chevy?
Customer: 2000 gmc 6500 series 8.4 liter
JA: Are you fixing your 2500 yourself? What have you tried so far?
Customer: yes. new crank and cam sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: fuel presure is 60 psi
Answered by Jerry Newton in 1 hour 5 years ago
Jerry Newton
20+ years of experience
8,478 satisfied customers
Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs
Do you have a scan tool that reads live data?
Customer
but no codes showing. unhooked negative cable for 1 hour. still not firing
Does it read rpm higher than zero when you're cranking the engine?
Customer
no rpm on scan tool
There is something wrong with the CKP sensor circuit, then. If the CKP signal was making it to the ECM, you'd have RPM higher than zero.
I know you replaced the sensor already. You'll need to chase the wiring, starting at the CKP connector, and put your hands/eyes on it from sensor to ECM and find where it's chafed or damaged.
Customer
could the ecm be bad?
It's possible, but not likely. When ECM's die in these trucks, they are generally completely dead, not just missing the CKP circuit.
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BackJerry Newton
8,478 satisfied customers
20+ years of experience
Jerry Newton
20+ years of experience
8,478 satisfied customers
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