Evening Guys
Do we have any ignition injection specialists available? Im running a 2000 P38B 4.6 on LPG @94k miles. Been running fine but noted some time ago that it seemed a little short on power. This has got worse over a period of weeks and began to definitely hold back at around 2500rpm under load and seemed a little worse on gas. Since the plugs and air filter were due for a change I did just that. The recent cold snap saw thing deteriorate, from cold start up (on petrol) is fine however it wont respond to throttle and so you can barely pull away, more throttle just leads to backfiring. Give it just a little while to warm up and thing get much better although slow to accelerate. Once switched to gas its much better still and, with a little coaching, can be driven but 2500 RPM seems to be a blocking point, out of gear it will rev higher. On the motorway 50MPH in top gear is OKish but it is most reluctant to go any faster, switch to petrol and now things are much worse, holding back misfiring etc.
Had the codes read on a generic Smartbox code reader with 11 codes coming up. Lambda bank 2, multiple misfires, misfire Cyl 8, misfire cyl 4, misfire low fuel, emission relevant misfire cly 8, emission relevant misfire cly 4, Plausibility check throttle angle(probable because driving requires a lot of throttle for not too many revs) and two unspecified codes 62,65,4,18 & 62,65,4,01.
Since then Ive fitted new coil packs and plug leads (which on inspection were in a bad way) but no different. Now it starts no problem, I let it warm up and swt to gas and its drivable but way down on power with a ceiling of about 2500 RPM complete with misfiring and holding back. On petrol its much worse and will barely do 25MPH.
I've checked all the obvious connectors and wires, all see ok. I've even cleaned the crank position sensor.
Provided I leave it with him all day my kindly local dealer will read the code with his testbook for only £99, which is a bugger because then I cant get to work to earn the £99 needed for his half hours work!
Thoughts Gentlemen please
Do we have any ignition injection specialists available? Im running a 2000 P38B 4.6 on LPG @94k miles. Been running fine but noted some time ago that it seemed a little short on power. This has got worse over a period of weeks and began to definitely hold back at around 2500rpm under load and seemed a little worse on gas. Since the plugs and air filter were due for a change I did just that. The recent cold snap saw thing deteriorate, from cold start up (on petrol) is fine however it wont respond to throttle and so you can barely pull away, more throttle just leads to backfiring. Give it just a little while to warm up and thing get much better although slow to accelerate. Once switched to gas its much better still and, with a little coaching, can be driven but 2500 RPM seems to be a blocking point, out of gear it will rev higher. On the motorway 50MPH in top gear is OKish but it is most reluctant to go any faster, switch to petrol and now things are much worse, holding back misfiring etc.
Had the codes read on a generic Smartbox code reader with 11 codes coming up. Lambda bank 2, multiple misfires, misfire Cyl 8, misfire cyl 4, misfire low fuel, emission relevant misfire cly 8, emission relevant misfire cly 4, Plausibility check throttle angle(probable because driving requires a lot of throttle for not too many revs) and two unspecified codes 62,65,4,18 & 62,65,4,01.
Since then Ive fitted new coil packs and plug leads (which on inspection were in a bad way) but no different. Now it starts no problem, I let it warm up and swt to gas and its drivable but way down on power with a ceiling of about 2500 RPM complete with misfiring and holding back. On petrol its much worse and will barely do 25MPH.
I've checked all the obvious connectors and wires, all see ok. I've even cleaned the crank position sensor.
Provided I leave it with him all day my kindly local dealer will read the code with his testbook for only £99, which is a bugger because then I cant get to work to earn the £99 needed for his half hours work!
Thoughts Gentlemen please
