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Old 03-29-2022, 05:19 AM   #1
hessam69
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Default Pinging, dieseling, lacks power, runs like ****e

I have a 1990 240 with 125,000 original miles, 100% stock one owner prior to myself

It pings badly, sometimes diesels (half-runs) after shutting down (especially on warm days), runs rough, idles okay but under load it hesitates and is generally unhappy.

I thought it had some carbon on the top of the pistons so I got a water bottle and fed some through the inlet manifold until about 2 quarts was used up, could not get any smoke from the exhaust, confused

The fuel consumption is great, around 300-350 miles from a tank. I'm using 91 octane Australian fuel (not sure but I believe that equates to 87 octane American)

It never misfires, but it feels like its underpowered, must be something to do with it pinging

Not sure what to look at next

Thanks in advance for any ideas
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Old 03-29-2022, 06:30 AM   #2
Otto Mattik
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Quote:
Originally Posted by hessam69 View Post
I have a 1990 240 with 125,000 original miles, 100% stock one owner prior to myself

It pings badly, sometimes diesels (half-runs) after shutting down (especially on warm days), runs rough, idles okay but under load it hesitates and is generally unhappy.

I thought it had some carbon on the top of the pistons so I got a water bottle and fed some through the inlet manifold until about 2 quarts was used up, could not get any smoke from the exhaust, confused

The fuel consumption is great, around 300-350 miles from a tank. I'm using 91 octane Australian fuel (not sure but I believe that equates to 87 octane American)

It never misfires, but it feels like its underpowered, must be something to do with it pinging

Not sure what to look at next

Thanks in advance for any ideas
Hello down under !

My experience with pinging was a LH 2.2 car not timed correct/running lean.
Here is a link that may give clues:

https://www.matthewsvolvosite.com/volvo-240-dieseling/



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Old 03-29-2022, 08:55 AM   #3
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Dieseling on an injected car? Might be some wiring problems.
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Old 03-29-2022, 11:16 AM   #4
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If it's pinging, it's reducing ignition advance, hence your lack of power feeling. Simplest thing to do would be put your 95 or 98 RON in it and see if that alleviates your problem. If it does, I'd try a different 91 RON from what you've been using. If it doesn't, then I'd say you have to go further. Does it start ok when it's cold? By cold I mean first thing in the morning, or if it's cool/cold outside and it's been sitting all day, or something like that.
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Old 03-29-2022, 11:42 AM   #5
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Leaky injectors for the dieseling?
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Old 03-29-2022, 01:58 PM   #6
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Knock sensor might be bad or not torqued to correct spec.; that can lead to pinging and poor running.
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Old 03-29-2022, 04:10 PM   #7
hessam69
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Thanks for the replies

It starts well cold and hot, though some starts take longer than others. Someone mentioned possible leaking injectors. I was going to service them anyway or replace them with the pink ones the seller on this forum supplies. I can swap a known good knock sensor to try.
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Old 03-30-2022, 09:42 AM   #8
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Leaking injectors would add fuel, heavy knock would be more symptomatic of not enough fuel. You could look at fuel pressure regulator for this.

Kinda sounds like a restricted cat converter.
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Old 03-30-2022, 01:02 PM   #9
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Also check the cam and dizzy timing. Mine was off a tooth from the PO and behaved like you described.

Or you could have a valve that's getting hot and/or already burned.
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Old 03-30-2022, 02:38 PM   #10
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Another vote for checking the timing here.

Any oil consumption?
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Old 03-30-2022, 03:12 PM   #11
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Zero oil consumption, very good fuel consumption, it's strange when I bought the car five years ago, I never noticed the poor running and pinging but it seems to have gotten worse every year, I don't drive the car much, will check cam timing and change all the belts and seals.

How would you check distributor timing? Being LH 2.4, would the ECU and EZK know the difference if the distributor was out? Even though there is nothing inside it and the timing is not adjustable, and I don't see any reason why someone would ever need to remove it
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Old 03-30-2022, 03:20 PM   #12
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Oops, missed that it was not a 2.2 car.
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Old 03-30-2022, 03:51 PM   #13
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Quote:
Originally Posted by hessam69 View Post
How would you check distributor timing? Being LH 2.4, would the ECU and EZK know the difference if the distributor was out? Even though there is nothing inside it and the timing is not adjustable, and I don't see any reason why someone would ever need to remove it
Actually verify the cam timing is correct. Sometimes the cam gear will loosen and shear the pin. Cam will still be "timed" by the parks, but the cam will be many degrees off.

For dizzy, TDC and remove the cap. Check rotor position. I've had people do hack work on cars where the plug wires were out of sequence due to the dizzy not being set in correctly. Then you get a ton of arcing from the rotor to the cap.

Otherwise it's the basics:
Fuel pressure
Check the coolant temp sensor
Check the MAF
Pull intake and check for leaking fuel injectors
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Old 03-30-2022, 07:01 PM   #14
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Quote:
Originally Posted by Mr. V View Post
Knock sensor might be bad or not torqued to correct spec.; that can lead to pinging and poor running.
this
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Old 06-20-2022, 05:48 PM   #15
hessam69
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It was a bad air mass meter.

I always thought air mass meters would either work or fail completely, but I've since learned that they can present different failures which still allow to car to be driveable, although poorly. I suppose if one or more of the six pins in the connector become damaged or disconnected, that can happen. I was getting codes 121 and 232.

The engine still diesels for around half a second to a second after shut down sometimes, and there is still a slight ping at low rpm and high load conditions, but it runs 100% better than it did.
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