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97 Chevrolet Z71starter drags when engine is operating temperature


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stevieg36
User

Sep 25, 2012, 9:07 PM

Post #1 of 7 (1969 views)
97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Starts perfect when engine is cold. Changed starter 3 times, all do same thing. New distributor,timing chain and gears, timing set perfect. It has done it since I bought it. Also replaced ground wires and main wire to the starter. I'm ready to throw in the towel. It has a v8 with automatic transmission


Hammer Time
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Sep 26, 2012, 3:05 AM

Post #2 of 7 (1922 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Have you replaced the starter under warranty every time so you are putting the same brand back in?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



stevieg36
User

Sep 26, 2012, 8:44 AM

Post #3 of 7 (1910 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Yes, all the same. I was thinking about trying a high torque starter.


Discretesignals
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Sep 26, 2012, 9:21 AM

Post #4 of 7 (1903 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Have you changed the crankshaft position sensor?





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Hammer Time
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Sep 26, 2012, 9:21 AM

Post #5 of 7 (1900 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Or at least a different brand. There is no such thing as a "high torque" option for any vehicle. If the application requires high torque, all replacements will be engineered the same, although the quality of the rebuild and parts used can be very different



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Sep 26, 2012, 9:40 AM

Post #6 of 7 (1895 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

probably means one of those aftermarket gear reducted starters.

There is a TSB running around for those for slow cranking, broken starters, and back firing. Problem with the crank sensor causing the PCM to advance the timing during cranking putting an ass load of resistance on the starter. Seen one where it broke the nose right off and another where it blew the gasket out of the back of the upper intake when it backfired.

Also when you replace the distributor you have to set the cam shaft offset, so the fuel injection is syncronized properly. You need a scan tool with the option to set the offset. Also when you replace the cranksensor it is a good idea to do a crank angle relearn.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 26, 2012, 9:47 AM)


Discretesignals
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Sep 26, 2012, 9:44 AM

Post #7 of 7 (1890 views)
Re: 97 Chevrolet Z71starter drags when engine is operating temperature Sign In

Engine - No/Hard/Slow Start/Backfire/Kickback


File In Section: 06 - Engine/Propulsion System

Bulletin No.: 00-06-04-014

Date: April, 2000

TECHNICAL
Subject:
No, Hard, or Slow Start, Backfire or "Kickback" During
Crank/Start, "Grinding" or Unusual Noises During Crank, DTC P0338
(Replace Crankshaft Position Sensor)

Models:
1999-2000 Cadillac Escalade
1995-2000 Chevrolet and GMC SIT Models
1996-2000 Chevrolet and GMC C/K, M/L, G, P Models
1996-2000 Oldsmobile Bravada
with 4.3 L, 5.0 L, 5.7 L or 7.4 L Engine
(VINs W, X, M, R, J RPOs L35, LF6, L30, L31, L29)

Condition:
Some customers may comment on one or more of the following conditions:

^ Backfire during crank/start
^ "Kickback" during crank/start
^ "No" start
^ "Slow" or "hard" start/crank
^ "Grinding" or unusual noises during crank/start
^ Cracked or broken engine block at the starter boss
^ Broken starter drive housing
^ Broken starter ring gear on flywheel
^ Any combination of the above

Cause:
A condition may exist that allows the crankshaft position sensor to command up to 50 extra degrees of spark advance during engine cranking only. This in turn exposes the engine to higher than normal cylinder pressures which may result in an inoperative condition to the starter drive housing, the engine flywheel starter ring gear, or the engine block at the outside edge of the starter boss.

Correction:
Inspect for a stored powertrain DTC code P0338. This DTC will NOT illuminate the "Service Engine Soon" light. If this code is stored, the Crankshaft Position Sensor, P/N 10456607, MUST be replaced and the remaining components inspected for damage (engine block at the starter boss, the starter drive housing, and the engine flywheel starter ring gear).

Notice : When DTC code P0338 is set, failure to replace the Crankshaft Position Sensor could result in repeated inoperative conditions of the starter or flywheel.

Important : Some flywheel wear is normal; broken or missing teeth and/or cracks, are not normal.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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