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Engine Not Cranking Over?

Tiny
PENGUIN66
  • MEMBER
  • 2004 OLDSMOBILE ALERO
This is gonna be long. 04 Alero, 3.4L comes in with no crank. No power to starter solenoid. Check relay, I have both powers (one from igntion switch, one from Park/Neutral switch) no ground from PCM. Ignition switch is sending live to PCM to tell it to crank. All lives and grounds to PCM are good. Changed PCM with a used one. No difference. I bypassed the PCM, with a relay and it cranks and starts but then dies. No security light comes on when it stalls. No oil or battery light either. I cannot communicate with any module with my Snap-On Solus. Sometimes the indicators in the dash don't work. Radio also will not turn on but it has it's power and ground. I am so confused! I've spent at least 12 hours already trying this one. Please help me!
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Saturday, February 14th, 2009 AT 1:52 PM

27 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Its sounds like the BCM has gone bad, this is a common problem with GM. Please check it and get back to me ;-)

This guide can help as well

https://www.2carpros.com/articles/starter-not-working-repair

Please run down this guide and report back.
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Sunday, February 15th, 2009 AT 5:39 AM
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2004 OLDSMOBILE ALERO
I tried to put a new stereo in my car not knowing the factory radio had an security system on it! Now my car wont fully turn over what do I need to do I have the new harness
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Tuesday, November 12th, 2019 AT 2:55 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The security means that the radio will not work in any other vehicle.

Check your wiring as you may have blown a fuse installing the radio preventing starting

Roy
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Tuesday, November 12th, 2019 AT 2:55 PM (Merged)
Tiny
KYLEO
  • MEMBER
  • 1 POST
  • 2003 OLDSMOBILE ALERO
Electrical problem
2003 Oldsmobile Alero 6 cyl Front Wheel Drive Automatic

wiht the fuses and relays in place the vehicle will not crank at all. Battery power at starter but no power to solenoid wire with key in start position. Have confirmed power at relay for both the signal and the battery power for solenoid. Bypassed the nuetral safety switch with no good result. Was able to get the engine to crank with term 86 of the starter relay grounded which makes the car turn over with the key in the on positoin. Seems to me that the pcm is not grounding the starter relay. Has anyone had this issue. Am I on the right track?
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Tuesday, November 12th, 2019 AT 2:55 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like you're on the right track -also see below


https://www.2carpros.com/forum/automotive_pictures/12900_s1_46.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_s2_43.jpg

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Tuesday, November 12th, 2019 AT 2:55 PM (Merged)
Tiny
HEIMLICK HIMLER
  • MEMBER
  • 1 POST
  • 2003 OLDSMOBILE ALERO
  • AUTOMATIC
  • 178,000 MILES
Car will not crank in morning or when wet.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for clean battery terminal ends and good connections. Check battery including load test most places do for free. Check grounds on engine and body from battery for good clean connections.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
BEAUTYNTHADARK
  • MEMBER
  • 3 POSTS
  • 2003 OLDSMOBILE ALERO
  • 179,000 MILES
Hello I have a Oldsmobile Alero 2003 it will crank but it wont start. The engine is turning over and the fuel pump hums but nothing happens. I recently had a new ignition switch installed maybe 3 weeks ago thinking that would solve the problem. Now the car won't start at all again. Do I need to replace the ignition module, ignition coil, or bcm? Or what? Losing money. Not being able to go to work. Please help! Bg
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Have you checked for codes yet?Also have you checked actual fuel pressure?Just because the fuel pump turns on doesn't mean its making the correct pressure.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
BEAUTYNTHADARK
  • MEMBER
  • 3 POSTS
*** I may need to add that it happens alot when its very hot outside.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So does anything else not work fuel gauge keyless entry door locks etc when there is no start? Also we still need to know if there is spark proper fuel pressure etc.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
BEAUTYNTHADARK
  • MEMBER
  • 3 POSTS
I dont even turn the car off until im at work or home so I cant afford to be stranded at the auto parts store. Its really annoying not being able to go somewhere on a wheem. I thought the fuel pressure was cool though if you hear the hum.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Just because a fuel pump runs doesnt mean its supplying the proper fuel pressure. With checking for codes checking spark fuel pressure etc Its really hard to say what's going on.I would get a scan on the computers with a professional scan tool that can readcode on all the computers
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
PHILLIP_DEPAUL
  • MEMBER
  • 1 POST
  • 2002 OLDSMOBILE ALERO
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 116,000 MILES
My car cranks and cranks but wont turn over. Before I had the security issue and got that taken care of. Now it just cranks. Mechanic said needs to engine because the comprssion. But once I do get it to start it runs great. I can mess with the key in the ignition and I know when it will start because I can hear the fuel pump priming the other times it does not. PLEASE HELP!
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
WELLDUHUH
  • MEMBER
  • 1 POST
  • 2001 OLDSMOBILE ALERO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 105,000 MILES
I have replaced the fuel filter, which I can hear power up, and the fuel filter. The car will not start, I have used starter fluid to see if it has spark and it does. I am at my ropes end here, help.

Thanks
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
So the engine DOES crank and run if starting fluid is used? Check the injectors and see if there is power to them, they make a noid light that plugs into the harness for this, but a test light can be used. If no power to the injectors check fuses and PCM power and ground. You can try a Passkey relearn if it's the security system.
Have you done a relearn on the pass-key?
GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
MZROBYN
  • MEMBER
  • 4 POSTS
  • 2001 OLDSMOBILE ALERO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 138,000 MILES
My car will not start. However, the engine cranks but does not fire. I checked under the hood and there was two red wires connected with a fuse at the bottom of wires just lying underneath my hood between the alarm siren and battery. Should this red wire be attached and if so where? Could this red wire not being connecting be the culprit? Please HELP!
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Tuesday, November 12th, 2019 AT 2:56 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try hooking it up to the battery positive post and see what happens-if it continues cranking and no start do below to determine if its fuel or spark.

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard
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Tuesday, November 12th, 2019 AT 2:57 PM (Merged)
Tiny
MZROBYN
  • MEMBER
  • 4 POSTS
Thank you for your response. How do I hook it up to the positive battery post? I know where the positive battery post is but how does the wire stay in place?
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Tuesday, November 12th, 2019 AT 2:57 PM (Merged)

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