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Engine starting issues - batteries & starter new

2005 Pete 379 w/2004 CAT ACERT engine. Lately I have been having an issue with starting. Starter acts like the batteries are low, slow crank followed by several clicks of the solenoid. Starter was replaced twice, once in February and then last week. Batteries were checked and replaced. Charging system was checked as well. All work performed at Peterbilt in O'Fallon, MO.

It appears if the engine is stopped at a certain point, the engine has a hard time starting. I have to keep turning the key to bump the engine several times until the engine acts like its "free" to start.

There is no consistency to this issue. It will happen after sitting over night or after running for 15-30 minutes between stops. I am starting to monitor the position of the engine by marking the dampener. So far, after 2 no starts, it appears to be at the same location.

Is it possible an ECM issue? Any help is greatly!

appreciated.

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Check your battery cables. Mine looked fine but with a volt drop check all but 2 were bad.

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Wires were checked, not visually, but voltage and resistance and that's how ground wire problems were found.

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It appears the main ground, a 4/0 cable from batteries to starter, was bad. Don't understand how they missed checking this wire last week......

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It still sounds like starter I know you said it's new. The new starter could still have a problem. A friend of mine had same problem put a new starter on would start sometimes just fine other times it would turn over like the batteries were dead.

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first starter was put on in February. Second starter was put on last weekend. Batteries were tested and replaced. Same results.

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You may be experiencing hydro-static lock in the engine. This is probably caused by fuel injector leak-off, dumping fuel into a cylinder while the engine is off. Pull an oil sample and check for fuel dilution. I hope you pull oil samples at a regular basis, this will help. If you have a little more fuel dilution than normal, you may have a leaking injector.

This happens like this...

When the engine has been turned off, there is still injector rail pressure. This injector rail pressure is leaked off through an injector into a cylinder. If the engine is on the compression stroke of that cylinder, this will make it very difficult for the engine to compress the fuel that is sitting on the piston.

Let us know if that is the issue. You will have to replace the injector.

If you are due for an overhead, you can have the shop manually build rail pressure while the injectors are out, you will see the leak-off.

You can also check the fuel rail pressure after the truck has been running, then again in an hour. Your truck should have a valve on the rail to check this pressure.

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Wouldn't this issue be more predominant if the truck was shut off over night rather than for 5-10 minutes. For example, last night after I dropped trailer and bobtailed over to Peterbilt shop, I shut off engine and tried to see if it would start. Engine wouldn't start. If I sit there and keep "bumping" the starter, eventually the engine would start like there is no tomorrow.

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The above was a suggestion to TEST the problem...if you check the fuel rail pressure, you should see a little bit of a difference in the pressure....another way to test the injector for leak-off is to drain the pressure off of the fuel rail while the damper is in the same position as it is when it's having the difficult start issue. If you drain the rail pressure, and you don't have the issue the next morning while the damper is in the 'locking' position where you've marked it...then it would ABSOLUTELY be a bad injector.

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It turned out to be the main ground cable from the batteries to the starter.

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I have a 2005 peterbuilt 387 new altenator new pulley tensioner new belt new battery and all it does is clicks sound just clicks can anybody help on this situation please

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It's sounds like the starter solenoid or if peterbilt has one mag switch relay which is usual on the firewall

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William Decker will be eternally grateful.
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