Age-related Volvo 1800E mechanic

[VolvoFan]

Can anyone recommend one of the above who knows these fuel injected cars well within a 20
to 30-mile radius of Alton, Hants? Thanks in advance.

[JP 1800]

Any classic workshop that deals with vintage Mercedes or Porsche should be able to work on the D-jet system. What problems are you experiencing?

[VolvoFan]

Thanks for your reply. I believe that my engine is running too rich from the blackish colour of the exhaust pipe and rich smell of exhaust. The car starts and runs well, both at idle and at cruising speeds.

I removed the spark plugs and found them all consistently darker than the normal grey/brown colour, although they weren't sooty. I also think that the fuel consumption seems slightly higher than usual.

I don't suspect any ignition irregularities, but will check cb points and dwell angle and ignition timing, although the mileage covered since they were checked & set last year, is under 500 miles.

[Clan]

Originally Posted by VolvoFan

Thanks for your reply. I believe that my engine is running too rich from the blackish colour of the exhaust pipe and rich smell of exhaust. The car starts and runs well, both at idle and at cruising speeds.

I removed the spark plugs and found them all consistently darker than the normal grey/brown colour, although they weren't sooty. I also think that the fuel consumption seems slightly higher than usual.

I don't suspect any ignition irregularities, but will check cb points and dwell angle and ignition timing, although the mileage covered since they were checked & set last year, is under 500 miles.

I expect the manifold pressure sensor has been tampered with over the years , it would be good to get that checked out and set up properly , has the sealed alloy blanking plug been drilled ?

[JP 1800]

Originally Posted by Clan

I expect the manifold pressure sensor has been tampered with over the years , it would be good to get that checked out and set up properly , has the sealed alloy blanking plug been drilled ?

Also check for a leaky cold start injector along with the 4 injectors. They may require a rebuild. The condition of the MAP can be checked with a mini vac and multimeter for functionality, however as Clan has pointed out, tampering of the MAP is a possibility

[c1800]

Hi, running rich could be as simple as a failed coolant temperature sensor, the one at the front of the head by the thermostat, not the one for the temp gauge located at the back of the head. Also check and clean the wire connections to the sensor. The sensor can be checked with an ohmmeter for proper resistance values. Info is located in the attached Djet fault tracing manual.

https://volvo1800pictures.com/docume...lt_tracing.pdf

[Burdekin]

Fit a O2 wideband sensor to the exhaust and have a gauge inside the car. Takes the guess work out if it and is so simple to then see the mixture at different scenarios. I bought a new kit from Innovate, about £170. You'll need to weld a boss into the exhaust. Mine is temporary so I just run the power from the cigarette lighter.

[VolvoFan]

Thanks for all your suggestions. I've been reading up on D-Jet faults and appreciate where they came from! However, if all this stuff needs checking/rectifying, I would need a specialist in Volvo F.I systems as I don't have the skills, knowledge or proper equipment to do most of the work myself. I've had the car for the past 32 years and the only F.I. component I renewed was the auxiliary air-valve. I don't think the manifold pressure sensor has been tampered with before, but I will check the seal for security.
d

[cassell]

Hi,

Good advice at #6 from c1800 regarding the temperature sender. Similarly, check and clean the incoming air temperature sensor at the point where the flexible inlet hose from the manifold meets the air filter housing to the right of your radiator.

Close to this point is where the positive crankcase ventilation hose from the flame trap joins the incoming air for recirculation and any oil-misted breathed air will coat the end of the sensor which by design, is right in the firing line. I suffered similar symptoms to you with my ES and whether it was coincidence or not, cleaning that sensor with degreaser seemed to solve the problem.

Paul