granada 2.9 inj, over fueling issue

[monstaink]

Hi guys, first off thanks for adding me,

I run a 2.9 granda engine in a buggy, it was running fine about 6 months back, but after an accident it has stood, now i have got round to repairing and straighening out the front end i tried to start it, it ran up great first time, but when i went back the following day to move it wouldn't start, so i done a few checks make sure i hadn't dislogged anything and all seemed fine, checked fuel ect and when i pulled the plugs they were like they had sat in a bucket of petrol, soaking wet, so i changed the plugs for a new set checked and changed the dissy cap and rotor arm as i had them for a service anyway, tried to start it and it tries but didn't kick into life, removed the plugs and they are wet again so i presume its over fuelling, has anyone had this issue or suggest where i start checking for faults, i'm old school ok with carbs or diesels but admittedly lost when it comes to injection.
Any help would be greatly appreciated

[Sticks.]

When this engine was fitted to the TVR S, throttle potentimeters were a problem, even from new (dealer always had a box of them), and particularly if it hadn't had enough use. I don't know whether they affect fuelling as well as ignition, though my understanding is it tells the ecu the throttle position, so possibly.

5 minute job to take it off and clean or replace it. After replacing it the first time I used to use a rubber and nylon lubricant (oo-er) rather then WD40 on mine.

Could be something else entirely but eaasily eliminated.

[monstaink]

thanks sticks for the reply,

this engine is fitted in a sort of rangerover chassis with alsorts of mods to it, runs as a 4x4 offroader.

i've cleaned and checked a lot of the parts as they were covered in mud and then it being stood for 3 to 4 year. when i first tried it it started first turn of the key that was 2 weeks ago, now its a pain to get to start if at all it does, all 6 plugs are soaken wet which is why i believe an over fueling problem, but where to even start looking

[TooMany2cvs]

If it was just one pot, injector stuck open, but not all six.
Sounds like there's too much fuel for it to be just thinking it's really cold due to duff coolant temp sensor.
Could be duff ECU or wiring holding the injectors full-open, but again all six?
Fuel pressure reg stuck closed, or return to tank blocked, so pressure way too high?

[shouldbworking]

TooMany2cvs said:

If it was just one pot, injector stuck open, but not all six.
Sounds like there's too much fuel for it to be just thinking it's really cold due to duff coolant temp sensor.
Could be duff ECU or wiring holding the injectors full-open, but again all six?
Fuel pressure reg stuck closed, or return to tank blocked, so pressure way too high?

From my experience with an xjs where the ecu died, 7/12 injectors full open put enough fuel in to stop the engine even cranking within 2-3 seconds

[TooMany2cvs]

shouldbworking said:

From my experience with an xjs where the ecu died, 7/12 injectors full open put enough fuel in to stop the engine even cranking within 2-3 seconds

Yeh, one would hydraulic lock it quickly - an injector is typically ~300cc/min, one pot is ~500cc on the OP's Grandad lump, but ~10:1 compression, so only about five/six seconds fuel needed - but the OP (actually, suggests rather than explicitly states) all six plugs are dripping.

[monstaink]

thanks guys yes all 6 plugs are wet, not just the one, return to tank is working this has a small tank fitted in the back end, and return is via the filler cap so easy to check, my thought were with return to tank running then the reg must be open to allow it to return, i have had it start with a lot of hassle getting it to start and once it does it runs wellish, not brill, lumpy shall we say so i'd expect the ecu to be ok, going to fit another new set of plugs tommoz along with leads disy cap and rotar arm see if it makes any difference will keep posted

Edited by monstaink on Thursday 23 October 22:36