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Author Topic: "Dieseling" sound when accellerating  (Read 6657 times)

Snigalfriz

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    • 1991 NA Capri
"Dieseling" sound when accellerating
« on: November 07, 2011, 09:47:00 AM »

Folks my capri is making a "dieseling" sound when accelerating or at highway speeds, any ideas?
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Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

rcdraco

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"Dieseling" sound when accellerating
« Reply #1 on: November 08, 2011, 12:27:00 PM »

Test the coil, check the wires, and possibly change the gap to the tighter tolerance of .24 as suggested.
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Snigalfriz

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    • 1991 NA Capri
"Dieseling" sound when accellerating
« Reply #2 on: November 09, 2011, 04:24:00 AM »

Thanks for the suggestions. I will be putting in new plugs, that I planned on installing last week, this evening and possibly wires.
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Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

blueamber

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  • Posts: 450
"Dieseling" sound when accellerating
« Reply #3 on: November 09, 2011, 08:23:00 AM »

So what do you consider dieseling?  If its clattering like a diesel engine does, then that's valves starved for oil, or timing is off...what?...chris
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Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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"Dieseling" sound when accellerating
« Reply #4 on: November 09, 2011, 08:54:00 AM »

Is it possible to take a video / sound clip of it?
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Snigalfriz

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    • 1991 NA Capri
"Dieseling" sound when accellerating
« Reply #5 on: November 09, 2011, 08:56:00 AM »

will try to get a sound clip.
Logged
Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

waretrop

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  • Posts: 74
"Dieseling" sound when accellerating
« Reply #6 on: November 09, 2011, 02:04:00 PM »

Is it really dieseling or a spark knock?  I have the original books for both our Capri's (91 N/A and 93 N/A) and they both mention that N/A can have an occasional spark knock and not to worry.  Also very strong reading and referncing NOT to use hi-octane gas.  Kerry
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91 N/A 5 sp - His
93 N/A Auto - Hers
93 Mustang LX Auto - ours

rcdraco

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"Dieseling" sound when accellerating
« Reply #7 on: November 09, 2011, 04:02:00 PM »

Mine occasionally does this since I'm a bit rich and it does it primarily on cold starts after a more aggressive park.  But it normally clears out after 5 minutes of "blowing the carbon out" with about 1/4 throttle blips.
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Snigalfriz

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    • 1991 NA Capri
"Dieseling" sound when accellerating
« Reply #8 on: December 18, 2011, 08:02:00 AM »

I can rev the engine in neutral, and you don't hear it.  When I am in gear and accelerating, you can hear it, or under any load like a 2nd gear start.
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Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

fayzaldean

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"Dieseling" sound when accellerating
« Reply #9 on: December 18, 2011, 08:27:00 PM »

check your timing
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rcdraco

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"Dieseling" sound when accellerating
« Reply #10 on: December 21, 2011, 06:58:00 AM »

You sure it's not a wheel bearing?  Does the wheel vibrate at all, does the sound increase/decrease with speed?  And another thing it could be if it occurs only when in gear under load, it could be a bad transmission mount and it's buzzing in a way that makes a weird sound.
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Rocketman

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"Dieseling" sound when accellerating
« Reply #11 on: December 21, 2011, 08:02:00 AM »

Does the car still have stock heat shields?
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Snigalfriz

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    • 1991 NA Capri
"Dieseling" sound when accellerating
« Reply #12 on: December 21, 2011, 07:20:00 PM »

I will check the wheel bearings for play.  As far as I know it has the stock heat shields.
Logged
Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

Snigalfriz

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  • Posts: 211
    • 1991 NA Capri
"Dieseling" sound when accellerating
« Reply #13 on: December 21, 2011, 07:21:00 PM »

I will check the trans mounts as well.
Logged
Why? I have more time than money, that's why I work on this car!

1991 Mercury Capri 5-sp
1992 Mercury Capri 5-sp swap
1999 Ford Contour SE 24v v6
2003 Lincoln LS
2007 Saturn Outlook XE AWD
2014 Chevy Cruze LT

rcdraco

  • Guest
"Dieseling" sound when accellerating
« Reply #14 on: December 22, 2011, 05:14:00 AM »

Is there actually any noticeable reduction of power when it's making the noise?  If not I highly doubt that it has any sort of miss.  Granted, a high-end miss is possible; but very unlikely unless your plug wires are coated with oil or your plugs are bad.
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