740 & 760 Unusual no start issues on a dual Gas/Petrol 740
This one's got me stumped. 740 16V with extremely low KLMS and done just a handful of KLMS in last decade.
FPR replaced after finding that was a source of rough running when petrol selected.
Now when it is running it runs well, but it doesn't want to start hot or cold (seems worse hot, but still very difficult cold). Seems slightly better to start on gas, but again difficult on both and once running it runs fine on both.
So I'm thinking it can't be;
- The AMM, since the the gas system uses some other method of fuel control I believe.
- The Fuel Injection Relay, since it's not required for gas and once running it runs fine.
- Can't be the CPS, since that would cause no run / intermittent no run issues, this is a start issue only.
Any thoughts on what can cause a no start / extremely difficult start on both gas and fuel then run fine on either once running?