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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum


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Old 04-15-2019, 12:36 PM   #31 (permalink)
JMJNet
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I have read somewhere that the CPS has to be relearn also.
Not sure if that is for a 95 since I never did it.

At any rate, TDC offset 0 is better than +2.02.
When you restart again without relearning, is the TDC still 0?
If the truck runs great at 0, then may need to drive it for a few days and see where it goes.

Which PMD did you use? Some PMD is also quirky with this old truck.

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Old 04-15-2019, 06:37 PM   #32 (permalink)
cliffyp
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Anytime I restart the engine it reads offset at 0. Whatever it “learned” that moved the offset to 2.02 is wiped with each restart.

I need to troubleshoot why it’s such a b*tch to get started, but figured I needed to get the timing issues cleared up, since that may be related to why it’s so hard to start.

I have 2 known good PMDs, so I don’t think they are contributing to this.

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Old 04-16-2019, 01:27 PM   #33 (permalink)
jnlperformance
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It's still +2.02? Or 0?

Have you turned/moved the ip clockwise towards the driver side?

Maybe a picture would help? Of the area where the pump and timing cover meet up. :

If you have moved it to the correct location where it should read in the (-).01-2.02 and it's still not holding the tdco relearn then your missing the reluctor ring (of which you could have stuck your finger in the hole or a flashlight to see if you have it during the CPS replacement) or your ecm has gone bad. Rare but it does happen.

That would be my best guess at the issue.

Code 19 is CPS reference issue. That tells me the CPS is bad or the reluctor ring is missing.
Code 88 is out of tdco range. (+)2.02-(-)2.02 is the maximum offset. Why I said to turn the pump towards the driver side. It could be a combination of incorrect pump timing position and a missing reluctor ring...

Just my thoughts on the issue.
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Old 04-16-2019, 01:43 PM   #34 (permalink)
cliffyp
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Quote:
Originally Posted by jnlperformance View Post
It's still +2.02?

Have you turned/moved the ip clockwise towards the driver side?

Maybe a picture would help? Of the area where the pump and timing cover meet up. [IMG class=inlineimg]/forum/images/smilies/confuzeld.gif[/IMG]:
It does not matter where I move the pump to, I get the same readings. Engine performance and sound will change when I rotate the pump. I’m out of town now and won’t be able to take pics till the week after next.

Things I’m wondering:

Did I goof and use the 6.2 timing set so there is no reluctor ring for the CPS to get a signal from?

Why is it so hard to start, but runs so well once it’s going?

Why does the offset reading always reset to zero after shutting off and restarting?
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Old 04-17-2019, 10:40 AM   #35 (permalink)
JMJNet
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I am not an expert but I think you need a reluctor for the CPS to work?

Glagulator may be able to confirm that.
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Old 08-02-2019, 12:39 AM   #36 (permalink)
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CliffyP, did you sort it out yet?

I put a 6.2 short block in a OBDI DS4 truck too and have the same prolonged cold cranking. Never set the timing as my old Snap-On "Red brick" scan tool read codes & live data but lacked the re-learn command. Put a manual override on the glow plugs, helped a bunch. Smokes like a SOB until it warms up.

Pretty sure I put all the 6.5 guts on the front of the engine but it was a while ago so who knows.

Hey experts, would no CPS signal disable the tach?
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Old 08-02-2019, 10:26 AM   #37 (permalink)
jnlperformance
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Quote:
Originally Posted by JMJNet View Post
I am not an expert but I think you need a reluctor for the CPS to work?

Glagulator may be able to confirm that.
Yes. Reluctor ring required for cps.

Crdstang; yes, no cps / no tach.

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Last edited by jnlperformance; 08-02-2019 at 10:28 AM.
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Old 08-14-2019, 09:19 AM   #38 (permalink)
cliffyp
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Apologies for not getting back to this thread sooner. I finally pulled off the front of the engine, and despite my certainty that I had used the 6.5 timing set, I was wrong. After swapping out for the correct 6.5 gear, timing readings and relearn all went well.

In regards to getting a tach reading. I believe the tach gets its signal from the alternator. I was getting tach reading even with CPS system not functioning.
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