Volvo 242GT 79 B23E - misfiring problem

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Volvo 242GT 79 B23E - misfiring problem

Inläggav sparkson » 17 mars 2017, 23:56

Hello Volvo fans!

Couple months ago I bought Volvo 242GT 79' with B23E engine K Jetronic. From the begginig my engine is misfiring: https://youtu.be/5iu2euYFy20
https://youtu.be/HvWRDPGXhdI

and I found mist of oil in intake manifold(I didn't overfilled it with oil. Crankcase ventilation hose was disconnected, so it could not get there by).

Already I have done:

- Changing the oil and filter
- Replacing the air filter
- Replacing the fuel filter
- Replacement of cables and spark plugs, even twice ...
- Install a new fuel pumps, preliminary and main
- Fitting a new fuel accumulator
- Replace and cleaning the fuel lines and fuel tank
- Checking the pressure in the fuel system according to the Greenbook
- Checking the performance of the fuel system and injectors
- Replace the injectors with new ones
- Checking compression pressure
- Regeneration head
- Replacement of Piston Rings and honing
- Replacement connectiong rods bearings
- Checking and replacing the timing belt
- Checking the timing settings
- Setting ignition
- Checking the the ignition system and ignition coil, Checking oscilloscope waveform Sparks (by induction probe) - Sometimes there by aberrant waveforms, but not so much lest there was no spark. The spark "shoots" at around 12mm when I was testing the coil.
- Re-soldering the whole "computer" (cold solder?)
- Checking patency of the exhaust system
- Cleaning the intake manifold
- Exchange All seals of the suction side
- Checking all vacuum hoses
- Substitution thermoregulation valve - WUR
- Replacing the seals (O-rings) on the valve in the fuel distributor
- Repair additional air valve
- Checking the electrical supply fuel pump

And still no change, my engine is working as before...

Maybe here somebody can help me because I've spent 3 months working on this car without success.... :cry: :cry:

Regards from Poland
Greg
sparkson
 
Inlägg: 3
Blev medlem: 17 mars 2017, 23:45

Re: Volvo 242GT 79 B23E - misfiring problem

Inläggav janneR » 18 mars 2017, 03:35

Does it also misfire under acceleration and steady speed or only when idling?

Mvh JR
244 GL -88b samt 244 GL -91
janneR
 
Inlägg: 592
Blev medlem: 29 november 2011, 08:47
Ort: Skogås nära Stockholm

Re: Volvo 242GT 79 B23E - misfiring problem

Inläggav sparkson » 18 mars 2017, 10:11

As You can see at the first video, at higher RPM it misfire less, but still. When it is driving is quite ok, and it is not misfiring like at video during acceleration.
sparkson
 
Inlägg: 3
Blev medlem: 17 mars 2017, 23:45

Re: Volvo 242GT 79 B23E - misfiring problem

Inläggav janneR » 21 mars 2017, 04:56

You have done a compression test, try a leak down test beacuse it can be that there can be a valve that does not tighten totally.

BR JR
244 GL -88b samt 244 GL -91
janneR
 
Inlägg: 592
Blev medlem: 29 november 2011, 08:47
Ort: Skogås nära Stockholm

Re: Volvo 242GT 79 B23E - misfiring problem

Inläggav sparkson » 21 mars 2017, 21:02

Valves were tested after cylinder head was redone, and they are fine.

I think that might be fuel related, because today on oscilloscope I saw something which directly corresponds to no-fuel misfire.
sparkson
 
Inlägg: 3
Blev medlem: 17 mars 2017, 23:45


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