Discussion
kerberus said:
Thanks, will ring austec tomorrow & get quote.
Could well be the injector but it's still worth doing the compression test, 14 months is also long enough for a valve to be sticking or the seat / stem of a valve to have corroded and prevent it seating properly. Comp test is quick, doesnt cost anything other than the time and will give fairly good idea of what's going on. Also, if the plug is wet after idling and you can smell fuel through the plug hole then the injector probably isn't the problem. If you do the comp test do the whole lot and record the values can be really useful info, esp if done perodically. Dont forget to isolate the fuel pump so its not dumping petrol in whilst you're cranking and wedge the throttle at least 1/2 way open.
injectors very unlikely.
as the cylinder fires at high revs a compression problem is most likely .If the engine used to run ok and its been stood for 2 years its probably a valve not seating properly get the hot oh and replace the petrol its going to be stale by now give it a couple of mile drive and it may well sort itself out once the engine is at high enough revs to fire it should burn out any gunk thats causing seating probs
good luck
as the cylinder fires at high revs a compression problem is most likely .If the engine used to run ok and its been stood for 2 years its probably a valve not seating properly get the hot oh and replace the petrol its going to be stale by now give it a couple of mile drive and it may well sort itself out once the engine is at high enough revs to fire it should burn out any gunk thats causing seating probs
good luck
Hi guys done compression test today, starting with No4
cylinder,all cylinders reading between 12.5 & 13.5 bar.so no valves and or piston ring problems.have spoken to shaun at V8developments and he was very helpfull.After checking fuel pressure in injector delivery pipe work,(very low) a new fuel pressure regulator was fitted along with a full tank of optmax & injector cleaner.Car run ok except for stalling when coming to a very quick stop.Also after setting the timeing up useing the marks on crank pully,I found that the engine ran like a bag of nails.After removing the rocker box on left hand bank & checking valve's & rotor arm postion I found that timing marks are out.I think Steve mention,s this in the bible.
>> Edited by kerberus on Sunday 1st May 12:00
cylinder,all cylinders reading between 12.5 & 13.5 bar.so no valves and or piston ring problems.have spoken to shaun at V8developments and he was very helpfull.After checking fuel pressure in injector delivery pipe work,(very low) a new fuel pressure regulator was fitted along with a full tank of optmax & injector cleaner.Car run ok except for stalling when coming to a very quick stop.Also after setting the timeing up useing the marks on crank pully,I found that the engine ran like a bag of nails.After removing the rocker box on left hand bank & checking valve's & rotor arm postion I found that timing marks are out.I think Steve mention,s this in the bible.
>> Edited by kerberus on Sunday 1st May 12:00
this is a common problem with range rovers and discoverys the inside and outside of the pulley are seperated by a fibre vibration damper i would recomend replacing it with a new one from a 1994 3.9 discovery (someone will chip in and say dont its balanced . but as its now turned its out of balance anyway) at least then yuou can set your timing right other wise with the rocker box off you should be able to get a pretty good idea of where tdc is
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