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Timing, firing order CK2500 TBI

Replaced rotor and cap, now motor won't run

Timing, firing order CK2500 TBI

Postby FastlaneMech [OP] » Feb 07 2013, 8:02pm

I have a 1987 Chevy Silverado CK 2500 TBI, it is automatic, 2wd. I kept getting a fault code 43. I replaced the rotor cap, rotor and the module under the rotor cap. Now the spark plug wires seem to be in the wrong order. I have a Hanes Manual that gives general info on these type trucks but it isn't quite right with my mmotor. I need the correct timing and firi h order and which plug is #1? This thing nackfired and deafened me and the janitor who was helping me. Also it won't start now. It tries but sputters out. Can anyone help me?
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Re: Timing, firing order CK2500 TBI

Postby mabinogeon » Feb 07 2013, 8:21pm

Driver's side front plug is cylinder #1. Double check that, to be safe. Should be in the front of your Haynes manual. Firing order will be in the manual, too.

There should be a sticker somewhere under the hood that tells you what you're timing should be. My old Ford 460 was 10btdc. Don't know if the GMs are similar, though.
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Re: Timing, firing order CK2500 TBI

Postby mabinogeon » Feb 07 2013, 8:23pm

Double check in your manual, but I think the firing order is 1-8-4-3-6-5-7-2. Distributor rotates clockwise.
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Re: Timing, firing order CK2500 TBI

Postby ASTE25 » Feb 07 2013, 9:36pm

^^^That's correct information.
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Re: Timing, firing order CK2500 TBI

Postby FastlaneMech [OP] » Feb 07 2013, 10:26pm

The Manual has two pictures for a V8, but it is a TBI not a HEI and it doesnt have points, and I tried the firing order and position of both pictures and neither works. Just trying to start and misfiring
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Re: Timing, firing order CK2500 TBI

Postby mabinogeon » Feb 07 2013, 10:30pm

Still think it could be your timing. Have to rotate the whole distributor to retard or advance it. Need a timing light, too.

I wouldn't think an '87 had points in it.
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Re: Timing, firing order CK2500 TBI

Postby 83choochoo » Feb 07 2013, 10:40pm

if its a 87 its a hei number one wire should be on front drivers side of distributer behind tbi and gm never used points after the mid 70s, and number i plug is also on the front driver side of your engine.thats if your distributer was put in right, small block distributers can be put in any position and still run good.
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Re: Timing, firing order CK2500 TBI

Postby FastlaneMech [OP] » Feb 08 2013, 1:48pm

Okay, she is running now,Thanks for your help. Now the fault code 43 is still displayed. I have replaced the ESC sensor, fixed broken wires and replace the EST module. I still have a error code 43. What can I do? If I have to change the EPROM in the lcomputer how do I do it? The ECM on this truck doesn't have anywhere I can change Mircochips or switches I can set. Any ideas?
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