Diesel Misfire Help

[205007 12]

a friend of mine is looking at a diesel engine conversion for this years 205 challenge and we found a sutable 405 1.9 td donor

 

problems is it misfires and smokes a little at idle and part throttle

 

i have driven the car and it makes good power, turbo boosts normally and holds pressure plus after a run it does not smoke under load at all unless you leave it idling for a few mins

 

the car also will not start if left for a few days unless you pump the little diesel primer on the lhs of the engine

 

we were advised the pump timing may be out, but all the pins lined up when checked

 

bit baffled as to why it misfires and smokes only at idle, it smells like unburnt diesel as opposed to oil

 

any pointers or experience with this?

[Richie-Van-GTi 72 2 Cars]

pump timing, th pump is bolted on 3 slotted holes, the pulley may line up but doesnt mean its in time. Try slackening the bolts with it running and turning it by hand slowly, the engine note will change and the characteristics will change.

[welshpug 1,657]

I'd avoid it personally, especially if its going in a challenge car.

 

plenty of others around that'll be miles better

 

BTW, pump timing can still be out even if the pins all line up as you alter the pump's position on its mounting bracket, exactly like advancin or retarding a Distributor (which it is basically, but for fuel)

 

a misfire on a pug diesel is normally poorly sealing injectors if it happens when warm, when cold its usually dead heater plugs but it should clear after a few seconds, as should any smoke.

[205007 12]

yeah but we bought the car now so stuck with it!

the car misfires hot or cold, but is marginally better when it has been running

 

whre are the bolts? for the diesel "timing" located then?

 

there is a bit of wetness around one of the injectors in particular

 

will probably play with the pump as suggested and then try injector seals if no joy

i assume the need to prime the diesel in the system is because of an air leak somewhere??

[welshpug 1,657]

if there's a leak it will suck in air as well as spray it out.

 

get a haynes manual is your best bet, they cover the diesel engines very well.

 

to get at the bolts to adjust the pump you need to remove the front timing cover, you'll see 3 bolts that you should be able to access through the pump pulley, and one on the back end of the pump.

 

you need a dial gauge and suitable adapters to set the timing.

[205007 12]

ok ill have a play with the dirty oil burner tomorrow and report

[DTORU 0 1 Cars]

Its A Faulty Injector, I Had The Same Problem.

[vern 0]

To stop having to prime it after being stood for a time, you need to replace the small rubber/plastic return hose that connects the injectors together.

I suffered the having to prime it for nearly 5 years before finding the problem, just make sure you get the right size hose I got mine from an injector speacilist and only cost about 50p and took about 25mins to fit.

[205007 12]

update to this, i adjusted the diesel timing as suggested and my god its a different car! i only "advanced" the timing about 1mm and instantly the engine went from a bag o s*it to a quiet purr!

 

there are 4x bolts to move the pump, 2 of which are an absolute ballache to get to unless you have a c spanner

 

also the car now pulls a lot better and went strainght through the emissions for the mot! as a result i have decided to keep it as it is and use it with some good old 59p cooking oil!