LT5 Ignition Systems Question??? - ZR-1 Net Registry Forums

POWERBRAKEBOB · 04-12-2014

Does anyone know if the MSD DIS-4 box will replace and remove the factory DIS Box?

XfireZ51 · 04-12-2014

Quote:

Originally Posted by POWERBRAKEBOB

Does anyone know if the MSD DIS-4 box will replace and remove the factory DIS Box?

Nope. Just an amplifier.

POWERBRAKEBOB · 05-25-2014

I'm still chasing this "cranks but won't fire" problem on mine. I have changed the IM, the CPS, tested the harness between CPS and IM, all fuses, tested the ECM and Jet chip, new battery, coils are new MSD 6 months old, all new injectors, have key on power to the coils, IM, and computer. NO trouble codes. Had the plenum off a dozen times.. Checked for bent pins on the IM. really causing me some problems. Any OTHER ideas?

Tyler Townsley · 05-25-2014

Fuel pressure? No spark across the plugs when cranking?

Tyler

XfireZ51 · 05-25-2014

Quote:

Originally Posted by POWERBRAKEBOB

I'm still chasing this "cranks but won't fire" problem on mine. I have changed the IM, the CPS, tested the harness between CPS and IM, all fuses, tested the ECM and Jet chip, new battery, coils are new MSD 6 months old, all new injectors, have key on power to the coils, IM, and computer. NO trouble codes. Had the plenum off a dozen times.. Checked for bent pins on the IM. really causing me some problems. Any OTHER ideas?

Have you installed a stock chip? When you turn KEY ON, does the SES light blink once? You won't get trouble codes till the motor runs. Are the pumps coming on?

POWERBRAKEBOB · 05-25-2014

I set a plug out on the engine with wire and cranked. NO spark. NO flash of the noid light. Sec light flashes, then goes out by turning key to ON. Key on, pumps run two seconds. Cleared door alarm. I did find a fuse burned out under the right dash. It looks to be marked "conx" or "cone" . I replaced ALL fuses on the right side of dash. VATS by passed. It was running when I parked it one night, next day, nothing. I bought a used IM from Brett. Replaced CPS, which did test "open". Tested the harness from CPS to IM for shorts. None. I'm sure it's something simple, but I can't find it, and my FSM's are buried in storage. Frustrating, and I need the car. It does have 268,000 miles on it, which I am sure is a record. No one has ideas on when things fail at what mileage.

04-12-2014	#1
POWERBRAKEBOB Join Date: Apr 2010 Location: HUNTINGTON BEACH, CALIF. Posts: 38	Re: LT5 Ignition Systems Question??? Does anyone know if the MSD DIS-4 box will replace and remove the factory DIS Box?

05-25-2014	#3
POWERBRAKEBOB Join Date: Apr 2010 Location: HUNTINGTON BEACH, CALIF. Posts: 38	Re: LT5 Ignition Systems Question??? I'm still chasing this "cranks but won't fire" problem on mine. I have changed the IM, the CPS, tested the harness between CPS and IM, all fuses, tested the ECM and Jet chip, new battery, coils are new MSD 6 months old, all new injectors, have key on power to the coils, IM, and computer. NO trouble codes. Had the plenum off a dozen times.. Checked for bent pins on the IM. really causing me some problems. Any OTHER ideas?

05-25-2014	#4
Tyler Townsley Join Date: May 2005 Location: Nichols, FL Posts: 611	Re: LT5 Ignition Systems Question??? Fuel pressure? No spark across the plugs when cranking? Tyler

05-25-2014	#6
POWERBRAKEBOB Join Date: Apr 2010 Location: HUNTINGTON BEACH, CALIF. Posts: 38	Re: LT5 Ignition Systems Question??? I set a plug out on the engine with wire and cranked. NO spark. NO flash of the noid light. Sec light flashes, then goes out by turning key to ON. Key on, pumps run two seconds. Cleared door alarm. I did find a fuse burned out under the right dash. It looks to be marked "conx" or "cone" . I replaced ALL fuses on the right side of dash. VATS by passed. It was running when I parked it one night, next day, nothing. I bought a used IM from Brett. Replaced CPS, which did test "open". Tested the harness from CPS to IM for shorts. None. I'm sure it's something simple, but I can't find it, and my FSM's are buried in storage. Frustrating, and I need the car. It does have 268,000 miles on it, which I am sure is a record. No one has ideas on when things fail at what mileage.