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Old 05-03-2016, 10:27 AM   #1
saturny
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Default Deiseling sound

Having an issue where when I'm accelerating (especially uphill) the car is getting a "deiseling" sound... kind of like the sound you get when you're in too high of a gear in a manual trans (this is an auto). My thought is either knock sensor of fuel pump...

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Old 05-03-2016, 11:35 PM   #2
TomM96
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Default Re: Deiseling sound

So it helps if indicate type&condition of vehicle--

If it's SOHC could be indication of low oil pressure>>knock, caused by head crack....

New knock sensors are cheap to replace.

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Old 05-04-2016, 06:44 AM   #3
poorboy
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1994 SL2
Default Re: Deiseling sound

Quote:
Originally Posted by saturny View Post
Having an issue where when I'm accelerating (especially uphill) the car is getting a "deiseling" sound... kind of like the sound you get when you're in too high of a gear in a manual trans (this is an auto). My thought is either knock sensor of fuel pump...
Timing Chain???

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94 SL2 Automatic

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Old 05-04-2016, 07:05 AM   #4
Highmile
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1995 SL1
Default Re: Deiseling sound

If this is the pinging sound and happens only under throttle it my just be pre-ignition or detonation.

easiest way to test is to put a high octane gas in it. If this helps you are on the right track.

Make sure you have the correct and in good condition spark plugs, wires, and coils.

Also verify no codes present. Knock sensor could be an issue but in all my experience I've only seen 1 bad one and it threw a code.

I'd also check for vacuum leaks and correct fuel pressure.

If your engine temp is off or if the etcs is bad it can cause issues with air/fuel mixture and result in pinging.

Good Luck
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Old 05-04-2016, 11:24 AM   #5
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Default Re: Deiseling sound

Quote:
Originally Posted by Highmile View Post
If this is the pinging sound and happens only under throttle it my just be pre-ignition or detonation.

easiest way to test is to put a high octane gas in it. If this helps you are on the right track. -I just filled up with premium with very little if any improvement.

Make sure you have the correct and in good condition spark plugs, wires, and coils.

Also verify no codes present. Knock sensor could be an issue but in all my experience I've only seen 1 bad one and it threw a code.

I'd also check for vacuum leaks and correct fuel pressure.

If your engine temp is off or if the etcs is bad it can cause issues with air/fuel mixture and result in pinging.

Good Luck
Highmile
'95 SL1 600k and counting
-I just filled up with premium with very little if any improvement.
-Spark plugs and wires are correct type and only 5k miles
-No codes are posting
-Engine temp sits exactly where it always has for 238k miles

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Old 05-04-2016, 11:26 AM   #6
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Default Re: Deiseling sound

Quote:
Originally Posted by poorboy View Post
Timing Chain???
I've heard a slack timing chain before and it doesn't sound like this. This sounds more like a lean fuel rattle/ping.

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Old 05-04-2016, 11:28 AM   #7
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Default Re: Deiseling sound

One other issue that reared it's ugly head at the same time as this is occasional hard or early shifts. I doubt the tranny issues are related but thought I'd throw it out there.

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Old 05-04-2016, 02:44 PM   #8
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Default Re: Deiseling sound

Rev the engine by hand so you can observe any engine movement from possible worn engine mounts. If the belt tensioner was never replaced, worn out ones allow belts to flop easily while idling. Fingers deflecting a belt without too much force is another way to detect a worn out tensioner. If worn, the pulley hits its end stop to make it seem as engine knock.

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