Missfire @ 4000rpm
#1
PassionFord Post Whore!!
Thread Starter
iTrader: (3)
Join Date: Jun 2003
Location: south wales
Posts: 6,062
Likes: 0
Received 0 Likes
on
0 Posts
Missfire @ 4000rpm
4x4 cos, stage 3 set up, revs fine upto 4000rpm then gets misfire, have changed
Plugs
Rotor arm
Dizzy cap ok
coil ok
new phase sensor
rewired fuel pump
any ideas what else to look at to rectify this
Thanks
Plugs
Rotor arm
Dizzy cap ok
coil ok
new phase sensor
rewired fuel pump
any ideas what else to look at to rectify this
Thanks
#7
PassionFord Post Whore!!
Thread Starter
iTrader: (3)
Join Date: Jun 2003
Location: south wales
Posts: 6,062
Likes: 0
Received 0 Likes
on
0 Posts
Stu, i put my plugs in it which are gapped as you said and still missfired and its been to a local tuner today and another new set fitted, fully checked over and they said it was phase sensor, changed that tonight but aint cured it. ill try crank sensor 2mrw for him. getting annoying now lol
Trending Topics
#10
lol i was about to post that mine is having the exact same problem, but i'm pretty sure it's the same car - i bought from Finny yesterday
We also replaced the amal valve with a new one today but no joy. So we tried by-passing it instead and then when it mis-fired / jutterd it would suddenly rev on past 4.5k and pull on very strongly to the limiter, we set the boost to 22 psi and it runs fine before and after 4.5k revs but it seems to be when it comes on full boost it misses / boost cuts in and out. We turned the boost right back down and reconnected the amal valve.
We re-checked everything again today from plugs and leads through to coil etc and no joy, checked all the sensors we could think off too.
If the boost is set to around 8 psi it pulls smoothly with absolutely no missing right throughout the rev range but alas i'd hoped stage 3 would see me into at least double figure psi
Terry
We also replaced the amal valve with a new one today but no joy. So we tried by-passing it instead and then when it mis-fired / jutterd it would suddenly rev on past 4.5k and pull on very strongly to the limiter, we set the boost to 22 psi and it runs fine before and after 4.5k revs but it seems to be when it comes on full boost it misses / boost cuts in and out. We turned the boost right back down and reconnected the amal valve.
We re-checked everything again today from plugs and leads through to coil etc and no joy, checked all the sensors we could think off too.
If the boost is set to around 8 psi it pulls smoothly with absolutely no missing right throughout the rev range but alas i'd hoped stage 3 would see me into at least double figure psi
Terry
#14
Engine Machinist
iTrader: (1)
Originally Posted by Smit
Hi Terry, is the rev counter ok? Doesn't wobble or anything when it missfires?! Leads not knackered?
#16
Originally Posted by MD Cos
Originally Posted by Smit
Hi Terry, is the rev counter ok? Doesn't wobble or anything when it missfires?! Leads not knackered?
#17
I'm Finding My Feet Here Now
Join Date: Jun 2004
Location: Isle Of Man
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
miss fire
Hi,
I had this problem on my LT Ecoss, Changed:
Coil
Plugs
Leads
Phase Sensor
Crank Pos Sensor
Fuel Filter
Fuel Pump
Rota Arm
Dis Cap.
Soldered the 2x multi Plugs on inner wing. etc etc
Had my snap on diagnostics pluged in, all ok, in the end it was the Multi-Plug to the crank Position Sensor, Cut it off replaced it with another one, been perfect ever since. Remember how old these cars are guys, the wiring has to put up with Turbo Heat, Water, road salt etc. for like 15+years!
Hope this helps,
Sean
I had this problem on my LT Ecoss, Changed:
Coil
Plugs
Leads
Phase Sensor
Crank Pos Sensor
Fuel Filter
Fuel Pump
Rota Arm
Dis Cap.
Soldered the 2x multi Plugs on inner wing. etc etc
Had my snap on diagnostics pluged in, all ok, in the end it was the Multi-Plug to the crank Position Sensor, Cut it off replaced it with another one, been perfect ever since. Remember how old these cars are guys, the wiring has to put up with Turbo Heat, Water, road salt etc. for like 15+years!
Hope this helps,
Sean
#19
Cheers for the replys,
The only thing on your list Big Man that we haven't changed is the fuel filter but as it pulls strongly when the missfire clears i'm not sure if it could be it?
Today we double checked all we'd done again. Also changed the crank pick up sensor with another one from my mates Saph. Changed the Injectors to another set of 803's and cleaned the connectors etc.
After that it seems to pull past the missfire easier in 3rd and 4th (when the amal valve is bypassed) but first and second it's still like hitting a brick wall of boost cut out.
One other strange thing is when it's building boost it just sits at a constant 10psi on the boost gauge and then when it clears the miss, it shoots directly to peak psi instead of gradually progressing but i wonder if this will improve when the amal valve is reconnected.
Just finished fiddling with it so going to try to get some sleep and not die from the all the fumes i stink off
Terry
The only thing on your list Big Man that we haven't changed is the fuel filter but as it pulls strongly when the missfire clears i'm not sure if it could be it?
Today we double checked all we'd done again. Also changed the crank pick up sensor with another one from my mates Saph. Changed the Injectors to another set of 803's and cleaned the connectors etc.
After that it seems to pull past the missfire easier in 3rd and 4th (when the amal valve is bypassed) but first and second it's still like hitting a brick wall of boost cut out.
One other strange thing is when it's building boost it just sits at a constant 10psi on the boost gauge and then when it clears the miss, it shoots directly to peak psi instead of gradually progressing but i wonder if this will improve when the amal valve is reconnected.
Just finished fiddling with it so going to try to get some sleep and not die from the all the fumes i stink off
Terry
#23
Originally Posted by Turbo lag
Any news
Dave.
Dave.
Still got the Misfire and not only that, it's now developed a knocking noise / vibration to the front left, almost like a wheel isn't on tight. However cause there's a bigger disc conversion and the anti-rattle clips wouldn't fit behind the wheels due to the clearance, i'm hoping it's the caliper. Taken it all off, greesed it up etc but still there so the car isn't being driven at all. It's not a warped disc , and there's no play in the wheel so i don't think bearing etc either, also checked bushes and had a poke about at the drive shaft.
I have the car booked in with an RS Specialist over here for the 5th of September so if all else fails and i can't get any of it fixed then i'll leave it with them and just fork out the money. Plus they can set it up properly too
The joys of owning an RS
Terry
#25
I was advised it probably wouldn't be it as on full throttle when the boost is turned down to about 8 psi, the engine revs out perfect.
But if there's a slight chance i'll give it a go
If anybody manages to solve this, there's a few beers in it for them (depending on if they hold a valid paypal account)
But if there's a slight chance i'll give it a go
If anybody manages to solve this, there's a few beers in it for them (depending on if they hold a valid paypal account)
#28
gapped the plugs to 0.6mm and no joy
Going to try changing the fuel filter too for the hell of it but the miss isn't random etc, always at the same rev when it's running above 8-9psi on full throttle, i thought it may have been more sporadic if it was the likes of a filter problem, but then i'm obviously no mechanic
Going to try changing the fuel filter too for the hell of it but the miss isn't random etc, always at the same rev when it's running above 8-9psi on full throttle, i thought it may have been more sporadic if it was the likes of a filter problem, but then i'm obviously no mechanic
#30
yeah changed the map sensor too.
I Just bought the IAW Monitor Software some of you may have seen in Fast Ford, bit like the Pectel Monitor from years old i'm told so this may help in my fight against gremlins, now and in the future lol. I got the version that allows you to data log etc so hopefully i'll get that on the go tomorow evening and i'll post up the results for someone to explain to me what most of them mean
www.remapping.co.uk
sounds like a great bit of kit and was a toss up between it and a SECS monitor
I Just bought the IAW Monitor Software some of you may have seen in Fast Ford, bit like the Pectel Monitor from years old i'm told so this may help in my fight against gremlins, now and in the future lol. I got the version that allows you to data log etc so hopefully i'll get that on the go tomorow evening and i'll post up the results for someone to explain to me what most of them mean
www.remapping.co.uk
sounds like a great bit of kit and was a toss up between it and a SECS monitor
Thread
Thread Starter
Forum
Replies
Last Post