95 vortec ecm fuse

blazin911 · 07-16-2006, 12:33 AM

hey fellas longtime no see, my apologies for not being able to post or reply my job requires me to travel. have a new problem with my truck, it only starts when i remove the ecm fuse and put it back in with the key on engine not running. i have a constant engine light unless i take the ecm fuse out with key on engine not running and replace it then it will turn on but seconds after the light comes on again. i have fuel pressur and spark back in my old post i mentioned i replaced everything in my engine top to bottom so im kind of lost. when it runs the rpm gage jumps around going crazy then it stops, some help if you could since the one guy s.....t on my thread. any help please

anyone here today to give some input

old_master · 07-16-2006, 12:26 PM

When the check engine light comes on, it's telling you that there is a malfunction. The computer stores the code in memory. Auto Zone and Advance Auto will retrieve the code(s) at no charge. Post the codes here and we will help you diagnose the problem.

blazin911 · 07-16-2006, 01:15 PM

hey i got the code its p1345 ignition misfire. i have a new ignition, coil, module, the crank sensor was put in 2years ago, i have new timing chain cap rotor plugs and wires

old_master · 07-16-2006, 02:42 PM

P1345 is "crankshaft/camshaft sensor correlation". What this means is that something is not aligned exactly right. It could possibly be that the crankshaft sensor is misaligned in its bracket, it may be loose, or it may be crooked. Other possibilities include the timing chain is not correctly timed, (off a tooth) and/or the distributor gear is not timed correctly in the camshaft gear, (off a tooth). P1345 is not a common fault code and it’s typically triggered due to basic engine problems. Your best bet is to obtain a shop manual and follow the flow chart for this DTC.

blazin911 · 07-16-2006, 11:57 PM

hey thanks for the tip, that tells me a lot, when my timing chain was replaced the mechanic grinded the crankshaft stud hole using the puller with a coned end instead of using the flat tip, and i think that the damper is coming outward therefor allowing the crankshaft spacer to move forward, thus causing a misalignment with the c. sensor. does this make sense please correct me if im wrong

BlazerLT · 07-17-2006, 02:41 AM

Quote:

Originally Posted by blazin911

hey thanks for the tip, that tells me a lot, when my timing chain was replaced the mechanic grinded the crankshaft stud hole using the puller with a coned end instead of using the flat tip, and i think that the damper is coming outward therefor allowing the crankshaft spacer to move forward, thus causing a misalignment with the c. sensor. does this make sense please correct me if im wrong

Yes, or the sensor itself is bad.

old_master · 07-17-2006, 06:23 AM

Quote:

Originally Posted by blazin911

hey thanks for the tip, that tells me a lot, when my timing chain was replaced the mechanic grinded the crankshaft stud hole using the puller with a coned end instead of using the flat tip, and i think that the damper is coming outward therefor allowing the crankshaft spacer to move forward, thus causing a misalignment with the c. sensor. does this make sense please correct me if im wrong

BINGO! Yes, that could definitely cause a misalignment. The pulse ring for the crankshaft sensor is part of the damper. If it is not aligned with the sensor, the sensor can not get a correct reading.

blazin911 · 07-17-2006, 11:33 PM

guys im going to knock this on its a....ss and post back and let you know what happens. thank fellas you guys are sh......izzle

ok fellas fixed the problem thanks to you guys, your gonna like this one here we go. well i took off the crankshaft pully and harmonic balancer and guess what i saw my harmonic balancer is a two peace held together by a rubber seal, well you know that on the balancer theres a timing mark which should corolate with the mark on the center which is the groov, well they where facing in different directions, it seems like the guy that did my timing chain was banging on the balancer to push it back on the crankshaft and it came apart and when he put it back together again he did not align the center groove for the crank with the timing mark on the outside of the harmonic balancer. this has been kicking my a.....ss for over a year and four months, thanks to you guys for making me go back to that crank sensor. you guys kick some serious a....ssssssssss
this forum is number one baby

the reason the truck started when i removed the ecm fuse is that it resets the computer temporarely once the truck is started the light would come back on. and when i turned off the truck i was back at the first square again

BlazerLT · 07-20-2006, 04:26 PM

yip, and go get the guy that did the timing chain to fix his crappy work.

blazin911 · 07-23-2006, 03:35 PM

hey fellas im back, small problem my ecm ignition fuse is popping every 5or6 days dont know what exactly is the cause, can a bad cap and rotor cause this hit me back

old_master · 07-23-2006, 05:26 PM

The distributor cap and rotor are not fused. So the answer to your question is no, this will not cause the fuse to blow. There is something else that is shorting out, or for some reason is drawing too much current.

blazin911 · 07-23-2006, 07:36 PM

What is the ECM ignition fuse for?

old_master · 07-23-2006, 07:40 PM

The ECM ign fuse protects the primary ignition circuits.

blazin911 · 07-23-2006, 09:37 PM

What would cause the ECM ignition fuse to pop?

old_master · 07-23-2006, 09:54 PM

Something in the circuit is drawing excessive current. Possibly the ignition coil, or the wiring to it.

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