cornishboater

cornishboater

Well-Known Member
I am not sure if anyone can point me in the right direction but I will ask. I have a 98 4.6HSE which has a random issue. Sometimes when starting it dies immediately or chugs a little and then runs fine (hot or cold) most times it starts and runs flawlessly. It also randomly stutters as if it is out of fuel when driving (always when slowly moving) It has also cut out when stopped in traffic. It always restarts when giving a bit of gas and most of the time runs beautifully. I thought that it may have been the fuel pump at first but it does it on LPG also. Any ideas as to what may cause this? Could it be a dirty MAF? Many thanks in advance for any help
 
Check crank sensor & connector. It's down the left passenger side of the engine, & a common location for oil or moisture to get in.

When it dies, do other electrics cut out as well ? I had an issue with the main battery connection on a fusebox, and had to open it up to re-solder.
 
cornishboater said:
I am not sure if anyone can point me in the right direction but I will ask. I have a 98 4.6HSE which has a random issue. Sometimes when starting it dies immediately or chugs a little and then runs fine (hot or cold) most times it starts and runs flawlessly. It also randomly stutters as if it is out of fuel when driving (always when slowly moving) It has also cut out when stopped in traffic. It always restarts when giving a bit of gas and most of the time runs beautifully. I thought that it may have been the fuel pump at first but it does it on LPG also. Any ideas as to what may cause this? Could it be a dirty MAF? Many thanks in advance for any help
Click to expand...

Hmmm, if it only did it hot I would suspect a crank or cam sensor starting to go. It may still be.

How old are the coil packs and HT leads?
 
pwood999 said:
Check crank sensor & connector. It's down the left passenger side of the engine, & a common location for oil or moisture to get in.

When it dies, do other electrics cut out as well ? I had an issue with the main battery connection on a fusebox, and had to open it up to re-solder.
Click to expand...
All other electrics are ok as far as I can see
 
Grrrrrr said:
Hmmm, if it only did it hot I would suspect a crank or cam sensor starting to go. It may still be.

How old are the coil packs and HT leads?
Click to expand...
HT leads/plugs are 2 years, coil packs as far as I know are AD 1997 :) I have had the old girl since 2010 and I haven't changed them prior to that my brother had it for 4 or 5 years and he certainly didn't change them.
It does it either hot or cold, usually I open the door and just start the car without touching the gas pedal and off it goes but occasionally it chugs and stops as if it needed choke, if I pop my foot lightly on the gas pedal it then starts with no problems. The concern is the random engine dying issue, it doesn't actually cut out just goes as if having kangaroo fuel, a couple of seconds and off it goes again!! I remember years ago when my MAF failed it was similar but it became terminal fairly quickly, this issue has been going on for quite some time.
 
it happens when running on lpg? so it can't be the fuel pump or rail pressure.
you can unplug the maf and drive without it, but it doesnt sound like a maf problem
also unlikely to be the idle air bypass valve
i think you need to see the injector timings, can't remember if nanocom does this but i think so
 
One thing to add is that it only (so far) does it at slow speeds, no misfires or hesitation when going faster, it does hesitate a little if booting it but then it always has so I usually put it in sport mode and it boots down fine.
 
Although I agree it's unlikely to be the IACV, worth checking & cleaning anyway.

Are all the LPG hose secure on the manifold ? Prob worth cleaning the throttle body & checking for leaks there as well.
 
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