vr v8 cranks but wont start help

[vr st8to]

Help at Witts end .
My vr v8 starto cranks but wont start . I have tried start ya bastard no luck . replaced the ignition module with a working second hand unit . replaced the hall efect sensor in the dizzy . replaced the coil.There seems to be an injector pulse . Fuel seems to be at the fuel rail . My friend cleared all the codes thinking he was helping with out recording any . No more faults have appeared . Has any 1 got any ideas . I was thinking of checking wiring loom and the BCM . Have also had a key guy come n check the key saying it is all ok . So im lost .

 

[BottleFedVS]

To me it sounds like the problem I've had with the BCM on 2 different cars.
IF the car throws up a "31" code it states that "Theft Deterrent signal is missing".(yes I read that your mate wiped the codes but there is a hope it will throw one up).
I had your problem on the wife's VR 5Lt Calais. it wasn't until I replaced the BCM that it threw up a "46",
Reference signal missing.
So I suggest if you can borrow a bcm of the same level to try or buy one from a wrecker with key fob (as they are coded to the BCM),
you may be able to eliminate that from the problem.
I am only suggesting "borrow" a BCM from a friend or buy second hand from a wrecker as they are so damn expensive new & you need to get a new key fob coded to it.!
I hope that helps.

 

[BlackVXGTS]

So you replaced the Hall Effect Sensor in the distributor. How did you make sure that you replaced the distributor in the position to ensure that the timing was correct? Also, did you replace the items in your list one by one testing whether each had solved your problem or did you replace multiple items at the same time and only test afterwards? How did the non-start happen - did it stop and then not start again, or did it just not start one morning or something else?

 

[vr st8to]

I replaced 1 @ a time and still had the same thing . Turns over fine but wont start . I made sure that N#1 was on TDC Before i placed the dizzy back in & the marks line up . The spark dose seem a bit on the weak side . I have a gp 125 2 stroke & the spark on that is a lot stronger . So to get a BCM at the same level dose that just mean the same number that is on it ??

 

[jeepyrocks]

Does it give any signs of starting- cough/splutter? or just continue cranking over and over?

If it wont start or at least cough with someone firing start ya bastard down its intake, then I would think its a spark issue.

 

[vr st8to]

It has spark but it seems very weak .

 

[strgas]

was #1 at TDC compression or exhaust , could be 180 degrees out still , double check all electrical connections look for corroded or backed out pins check for poor earths or bad connections .

 

[BlackVXGTS]

Have you set the base timing to 10 degrees BTDC in diagnostic mode using a timing light?

If you don't have a timing light, try loosening the distributor clamp bolt a little so that you can rotate the distributor. While someone else is cranking the starter, rotate the distributor slowly about 30 degrees in either direction and see if it starts at any point. Use a gardening glove or thick rag on top of the distributor not your bare hand.

 

[BottleFedVS]

The levels on the bcm's are "Low, Med, Hi and Lux".

 

[wildfiremaint]

Bump.
Have you found the problem yet ?
Happy New Year.