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I recently bought a Sierra 1.8 t/diesel,M.O.T'd it and parked in my garden for a month.It now has no power and chucks out loads of dark grey smoke.When I got it it went like a rocket,the only thing I did to the engine was Gunk it and hose it down.It has the CAV pump,I have checked the timing of the belt for this and for the cam.The only clue I have is that it seems to be O.K.for a couple of minutes after a cold start,so is it the cold start staying on?My knowledge of diesels is limited and the Haynes is not good.Any suggestions appreciated as this has got me stumped,as well as annoyed.
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A few things to check are, did any water enter the air filter assembly soaking the element, where gunk is oily its possible that timing of either your pump or cam may have jumped (these engines have two belts, one for the cam and one for the pump).
The only cold start they have, is the heater plug circuit. This stays energised for approx. 45sec to 1min after starting, you can hear when the relay drops out or when the engine note slightly increases.
When you say you have checked the timing did you use a special tool inserted in the block to set the crank in the correct position and dowels in the camshaft and pump pulleys. If all is ok then that rules the timing side.
Until you've checked these, no more help can be offered. Sorry mate.
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Thanks for replying,belt timing O.K.
I started it from cold yesterday,took it straight onto the road and it went like it should.Within a minute it had lost power and I had to chug back in 1st.According to Haynes there is a unit in the pump which advances the timing and supplies more fuel.I wondered if this had stuck on,but can't see how I can check it.Completely baffled.....
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A couple of things I could think of are the pump timing, and the egr.
If it is starting easily from cold, then the timing shouldn't be too bad. Although the cold start solenoid on the front of the pump (assuming it has one) could be advancing it enough to start and run ok until it is de-energised, thus retarding the timing too far.
As far as the egr (exhaust gas recirculation) goes, pull the hose off the egr valve on the inlet manifold and plug the hose. You should find this in your Haynes.
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Cheers for that,I tried clamping the vac hose for the EGR,no luck,checed the valve is not stuck open too.Pulled the injectors out today and gave them a clean,it now speeds up(if it was petrol I would say it was hunting).I will have to look more closely at pump timing.Also,out of interest,does anyone know why there is a throttle pot on the throttle lever when there is no ECU?Mine had damaged insulation causing the wires to short,which gave me a brief stab of hope...
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Is it a pot, or is it a micro-switch (or two)?
If I remember right, our old Clio had one or two micros to cut out the glow plugs when the engine was revved, as these were timed to operate for up to 2-3 mins after a cold start.
Another thing could be that it is losing turbo boost, so it is not properly able to burn all the injected fuel. Although I'm not sure how you go about checking this.
I imagine there should be more brains browsing about here able to you out with other ideas.
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If this pod you mention is on the lever on the pump with two pipes attached, then its a vacuum micro switch for the ERG valve at the right rear of the Cylinder head, its closed at tick over speeds, you should have no vacuum in the pipe if you remove it from the ERG diaphram valve while ticking over.
I can't see this has any connection with your problems as it re-circulates some of the exhaust gases back into the inlet manifold to help control emmissions, the vacuum comes from vacuum pump circuit for the brakes.
If you decide to go to garage to solve the problem, don't bother with a basic garage or dealer because they will contract it out to a diesel specialist and add a charge on top. Best look for a Diesel pump repair specialist in your Yellow pages, they will advise more or less on the spot of your problem if its the pump.
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The clue might be in that you hosed the engine down. I had exactly the same with a Rover 75 diesel. Gunked then washed the engine down, it ran OK for a bit then died. I never really found out why but I disconnected every electric plug, socket and connection under the bonnet, some were actually dripping water. I dried them all out with a hair dryer and the engine eventually ran OK.
Worth a try!
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