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Doug
Doug, ASE Master Technician
Category: Chevy
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Experience:  ASE Master Tech. 32 years experice
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Chevrolet 1998 S10: 1998 chevy s10 wont start no fire, replaced

This answer was rated:

1998 chevy s10 wont start no fire, replaced cap rotor,and coil

Doug :

Thank you for choosing justanswer.com,I look forward to helping you,Doug

Doug :

Can you give me the 8th serial #

Customer:

are you talking about the VIN #

Doug :

YES

Customer:

x

Doug :

OK and you say you have no spark

Customer:

yes

Doug :

OK give me a few need to pull up you igniton system

Customer:

no problem

Doug :

OK do you have test light

Customer:

yes

Doug :

With the key in run position can you back probe the pink wire at coil to see if you have power , if you do then please back probe the white wire with black stripe at coil light should flash while cranking over engine,

Customer:

ok i will try this may take a bit running back and forth

Doug :

NO problem

Customer:

ok tried it and it did not impulse

Customer:

but i do have power to the pink wire

Doug :

BUT you did have power at pink wire

Customer:

yes

Doug :

Good do you no where the crankshaft position sensor is at

Customer:

Yes i do

Doug :

OK with key in run position UN plug CPS.Check for power at the pink wire and ground on the purple wire, also hold connector and pull on wires to make sure they are not broken

Customer:

be rt back

Doug :

K

Customer:

no power at the pink wire and the wires seem to be ok

Customer:

let me try again forgot to turn on the key

Doug :

K

Customer:

yes still have power to the pink wire

Doug :

OK give me a minute please

Doug :

OK next please pull out CPS should be a 8mm socket or a 9/32 will work look at the end of sensor that would be inside engine for very small Marks or damage

Customer:

ok

Doug :

sorry look for marks

Doug :

1998 Chevy Truck S10/T10 Blazer 2WD V6-4.3L VIN X


Vehicle Level Powertrain Management Computers and Control Systems Crankshaft Position Sensor Technical Service Bulletins All Technical Service Bulletins Engine - No/Hard/Slow Start/Backfire/Kickback


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.


Doug :

Good morning, How did the CPS. look, Doug

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