loud knock
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Senior User
Joined: Jun 2004
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loud knock
When the engine is cold and i first start it the motor knocks louder than normal, But after about 2 minutes it goes away. Then the motor sounds like it should. Could this be the oil pump finally pumping the oil after about 2 min? If I hold the petal at about 1000 rpm's when first started its not loud but still louder than normal.
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Senior User
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"IDIDieselJohn Sounds like a leaky Injector."
It has new, injectors, lift pump, injection pump, and glow plugs. Under 1000 miles on all of it. Plus it did this before all the work was done to it.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
The timing could be too advanced and the timing advance places it even further advanced.
Fast Idle Adjustment
At Cold Idle Solenoid:
1. Place transmission in NEUTRAL or PARK.
2. Start engine and bring up to normal operating temperature.
3. Disconnect fast idle solenoid from wiring harness.
4. Apply battery voltage to solenoid to activate it.
5. Rev engine momentarily to set solenoid to activate it.
6. Check fast idle speed setting. Fast idle rpm should be 825 ± 25. Adjust to specification by turning solenoid plunger in or out (Figure 11).
7. Rev engine momentarily and check fast idle rpm. Adjust as necessary.
8. Remove battery voltage from solenoid connector and connect to wiring harness.
Fast Idle Adjustment
At Cold Idle Solenoid:
1. Place transmission in NEUTRAL or PARK.
2. Start engine and bring up to normal operating temperature.
3. Disconnect fast idle solenoid from wiring harness.
4. Apply battery voltage to solenoid to activate it.
5. Rev engine momentarily to set solenoid to activate it.
6. Check fast idle speed setting. Fast idle rpm should be 825 ± 25. Adjust to specification by turning solenoid plunger in or out (Figure 11).
7. Rev engine momentarily and check fast idle rpm. Adjust as necessary.
8. Remove battery voltage from solenoid connector and connect to wiring harness.
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Senior User
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Cant say for sure, being i have not paid attention to a power stroke start. But I would have to say mine would be much louder.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
I don't mean when they start, the 7.3 has a rattle, Power Stroke rattle, when they are idling hot or cold.
Advanced timing on an IDI will cause the same rattle while the timing advance is on until the engine temp reaches 112 degrees and it returns the timing to normal.
If the timing was set incorrectly by someone in the past, the Power Stroke rattle could be present at all times, just much worse when the timing advance is on.
What is causing the rattle is combustion starting before the piston reaches TDC, so it would be like spark knock or detonation on a gasser.
Advanced timing on an IDI will cause the same rattle while the timing advance is on until the engine temp reaches 112 degrees and it returns the timing to normal.
If the timing was set incorrectly by someone in the past, the Power Stroke rattle could be present at all times, just much worse when the timing advance is on.
What is causing the rattle is combustion starting before the piston reaches TDC, so it would be like spark knock or detonation on a gasser.
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Thread Starter
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Senior User
Joined: Jun 2004
Posts: 238
Likes: 0
I don't mean when they start, the 7.3 has a rattle, Power Stroke rattle, when they are idling hot or cold.
Advanced timing on an IDI will cause the same rattle while the timing advance is on until the engine temp reaches 112 degrees and it returns the timing to normal.
If the timing was set incorrectly by someone in the past, the Power Stroke rattle could be present at all times, just much worse when the timing advance is on.
What is causing the rattle is combustion starting before the piston reaches TDC, so it would be like spark knock or detonation on a gasser.
Advanced timing on an IDI will cause the same rattle while the timing advance is on until the engine temp reaches 112 degrees and it returns the timing to normal.
If the timing was set incorrectly by someone in the past, the Power Stroke rattle could be present at all times, just much worse when the timing advance is on.
What is causing the rattle is combustion starting before the piston reaches TDC, so it would be like spark knock or detonation on a gasser.
