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 > Difficulty timing a 1995 Chevy 454ci

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enblethen

Moses Lake, WA

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Posted: 03/02/23 08:20am Link  |  Quote  |  Print  |  Notify Moderator

Did you check the sensor on the distributor shaft to make sure it cleared the pick up coil? Make sure it is turning when engine is being cranked.
Have you tested the coil? maybe a bad part!


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RLS7201

Beautyful Downtown Gladstone, MO

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Posted: 03/02/23 02:52pm Link  |  Quote  |  Print  |  Notify Moderator

When you replaced the Dizzy, did it come with a new cap and rotor?
Does the dizzy still has a black rotor, it could be arching through in the center to the metal below. Learned that the hard way. Those 50,000 volt ignition systems need a colored aftermarket rotor. I.E. white, red, blue, green, etc.

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OutofTime

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Posted: 03/02/23 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

RLS7201 wrote:

When you replaced the Dizzy, did it come with a new cap and rotor?
Does the dizzy still has a black rotor, it could be arching through in the center to the metal below. Learned that the hard way. Those 50,000 volt ignition systems need a colored aftermarket rotor. I.E. white, red, blue, green, etc.

Richard


I bought the dizzy as a package deal from Amazon, so it has a black cap. But it also came with a new pickup coil and wire, plus new Ignition Control Module. I can verify that I'm getting spark from the coil to the cap, and from the cap to individual spark plugs. I tried timing it off cylinder 8 using the bottom timing marks, got nothing. I inserted a 1/4 extension into the spark plug well on cylinder 1 and rotated until it got stuck and tried that. Nothing. If I was 180 off I would expect at least a snort or two but... nothing.

enblethen

Moses Lake, WA

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Posted: 03/02/23 09:25pm Link  |  Quote  |  Print  |  Notify Moderator

Timing using bottom indicator is either 5 or 7 not 8. The indictor point can be on lower right or left side of engine.

JoeH

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Posted: 03/03/23 09:06am Link  |  Quote  |  Print  |  Notify Moderator

How many miles on the engine ? Have you checked the timing chain ?


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OutofTime

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Posted: 03/03/23 09:17am Link  |  Quote  |  Print  |  Notify Moderator

JoeH wrote:

How many miles on the engine ? Have you checked the timing chain ?


It does have north of 200k on it. I am thinking about the timing chain, but it was running, driving just days ago. Hurts my brain a bit to think about it. A timing job would involve dropping a front cover, removing the crank/harmonic balancer/water pump right?

enblethen

Moses Lake, WA

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Posted: 03/03/23 09:29am Link  |  Quote  |  Print  |  Notify Moderator

I am betting on a bad new part!

OutofTime

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Posted: 03/03/23 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

I am betting on a bad new part!


I've been burned by that in the past, but all the parts I've replaced so far have verified. I have spark from the coil to the cap, from the cap to the individual plug wires to the plugs. To have that all the new ignition parts have to be working. I've replaced coil, dizzy and then threw in plugs and wires because I didn't know the age of the wires and the plugs were pretty fouled. I'm going to try and time off the number 7 cylinder tomorrow and check the location of the timing mark on the balancer when I do it, to see if it's close or possibly 180 off or slipped.

I'm also going to reconnect the computer advance after I set the base timing at 4 degrees BTDC and see what happens.

I put more thought to the timing chain slipping but I don't think that is the case. I have compression across the cylinders though from the way the starter sounds it's not even. I think this is a case where I don't fully understand what is going on with the engine timing.

I'm also going to change out the fuel filter tomorrow in case that was impacting drivability, though from what fuel I see spraying out of the TBI I don't think fuel is an issue for idle.

enblethen

Moses Lake, WA

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Posted: 03/03/23 07:04pm Link  |  Quote  |  Print  |  Notify Moderator

my memory says if bottom timing arrow is on passenger side, timing is off 7. Driver's side is 5.

Vette Racer

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Posted: 03/03/23 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

If the timing chain was off enough that it won't hit and miss it should be cranking really fast as in no compression.


KE5NCP
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