random missfire ...
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random missfire ...
was driving up a mates about 20miles
half way and the cav starts to misfire then gets worse and cuts out
so I ring my mate to come get me (bout hour wait)
he arrives I try to start it and it fine wtf so we towed any way
got back home and said well take it down the duals and rev it abit all was fine till it got warm and missed again then got worse n cut out?
really strange
any ideas
also fitted my magnecore leads off the 4x4 just to rule it out aslo checked plugs
thanks
half way and the cav starts to misfire then gets worse and cuts out
so I ring my mate to come get me (bout hour wait)
he arrives I try to start it and it fine wtf so we towed any way
got back home and said well take it down the duals and rev it abit all was fine till it got warm and missed again then got worse n cut out?
really strange
any ideas
also fitted my magnecore leads off the 4x4 just to rule it out aslo checked plugs
thanks
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
Cts, drives fine when cold until It warms up. Then splutters and cuts out.
Ive just sorted the same problem.
Ive just sorted the same problem.
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Re: random missfire ...
Yep, or something breaking down when hot. Crank sensors, coils and ignition modules can all do this
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: random missfire ...
just wont start when its warm at all
so
cts
coil
coil amp?
so
cts
coil
coil amp?
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
Reproduce the fault, check spark. If it has spark then look at the cts and wiring which often had insulation failure inside the black plastic tubing it is in. If the eml doesn't go out on cranking at all then look towards the crank sensor. No spark could mean coil or amp but equally the crank sensor that's why it's good to look at the eml on cranking.
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: random missfire ...
aww il check tomoz
but it will start no problem as it will be cold lol so will have to warm her up lol
but it will start no problem as it will be cold lol so will have to warm her up lol
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
Re: random missfire ...
Just sell the car to me , no worries then lol
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Re: random missfire ...
nooo il break it first
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
so far I've changed.....
CTS for a genuine bosch one (it had shitty aftermarket one fitted)
Genuine metal crank senor (it had shitty plastic aftermarket one fitted
swopped whole dizzy unit off my 4x4 gsi along with magnecore leads n new plugs
ain't had chance to change coil or coil amp yet (coil amps aint cheap !! )
but so far problem is still there only when warm
CTS for a genuine bosch one (it had shitty aftermarket one fitted)
Genuine metal crank senor (it had shitty plastic aftermarket one fitted
swopped whole dizzy unit off my 4x4 gsi along with magnecore leads n new plugs
ain't had chance to change coil or coil amp yet (coil amps aint cheap !! )
but so far problem is still there only when warm
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
Have you had a chance to reproduce the fault and check for spark when it won't run? If it has no spark then you are more than likely left at coil or amp. If it does have spark then fuel pump or relay, relay being the more likely of the two
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: random missfire ...
aint had chance to check spark yet
ive left it get warm on my drive and reved it and nothing , take it out on the road foot down and the splutter and cut out and wont restart
I may just swop coil n amp and fuel relay from my 4x4
btw only now noticed I aint got a engine man light
ive left it get warm on my drive and reved it and nothing , take it out on the road foot down and the splutter and cut out and wont restart
I may just swop coil n amp and fuel relay from my 4x4
btw only now noticed I aint got a engine man light
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
coil n amp changed along with fuel relay
still got the problem
been told "could be head gasket?? strange I know thought id ask
still got the problem
been told "could be head gasket?? strange I know thought id ask
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
How strange, someone used to modern cars that have overheat protection perhaps. You have covered the common stuff now, so you are going to need to narrow it down a bit by checking what you do and don't have when the fault occurs. Fuel and/or sparks. Given that you have changed the dizzy, coil, amp and effectively the entire ignition it is probably safe to assume that the problem is going to be fuel side, but check it anyway. The only other thing that could affect the ignition is the ecu. Fuel wise, did you inspect the wiring for the cts as suggested? Jury rig a bulb on the fuel pump feed so you can instantly see if it loses its supply? There's not much left really that fits the symptoms but if you can follow the diagnosis process to determine what you do and don't have, rather than randomly changing bits, then it will help to pin down the cause. You get the odd ones occasionally that defy logic and the cause doesn't fit the symptoms properly.gsi pie wrote:coil n amp changed along with fuel relay
still got the problem
been told "could be head gasket?? strange I know thought id ask
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: random missfire ...
no this is strange
the car can be left ticking over for ages on my drive fan kicks in n out fine no problems
but if you drive it then it will cut out with in 15mins
once it cut out , if you press the valve on fuel rail just air comes out n spits tiny bubbles or fuel ..
leave it alone for half hour and shell fire back up wtf
this is no getting to me ive spent all day swopping parts around and driving and getting it towed back home lol
spark is fine when its cut out
so looks like a fuel issue
the car can be left ticking over for ages on my drive fan kicks in n out fine no problems
but if you drive it then it will cut out with in 15mins
once it cut out , if you press the valve on fuel rail just air comes out n spits tiny bubbles or fuel ..
leave it alone for half hour and shell fire back up wtf
this is no getting to me ive spent all day swopping parts around and driving and getting it towed back home lol
spark is fine when its cut out
so looks like a fuel issue
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
yes gaz
external pump then a FPR thingy then filter all on a bracket tucked up the N/S chassis leg
external pump then a FPR thingy then filter all on a bracket tucked up the N/S chassis leg
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
Definitely fuel supply then. Damper, as Gaz suggests is possible, though I have never heard of one causing these symptoms myself. Other ideas, obviously pump, vacuum in the tank due to blocked breather? crap in tank blocking the pickup? You swapped the relay didn't you? Volt drop at the pump?
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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Re: random missfire ...
yes relay swopped over and still same
aint checked voltage at pump yet
blocked breather?
aint checked voltage at pump yet
blocked breather?
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
Take the fuel filler cap off pie, if you have tank breathing issues it can lead to a vacuum in the tank that the pump struggles to overcome. Removal of the cap prevents the vacuum build up helping to diagnose if this is what's going on.
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
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- Joined: Tue May 10, 2011 7:24 pm
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Re: random missfire ...
il give it ago tomoz
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
the damper thing had been bypassed at some stage
voltage is fine at pump,
im think I could have a hole some were from tank to pump ??
or hole in pick up or ring ?
thinking this as it fine on tick over stood still ,only cuts off when driving (bout 15mins of driving and it splutter n stop n no fuel in rail)
voltage is fine at pump,
im think I could have a hole some were from tank to pump ??
or hole in pick up or ring ?
thinking this as it fine on tick over stood still ,only cuts off when driving (bout 15mins of driving and it splutter n stop n no fuel in rail)
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
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Re: random missfire ...
just looking on google now at problems and came across this..
viewtopic.php?f=6&t=7739
"if it is the relay then the EML wont light up with the ignition" ???
^^
viewtopic.php?f=6&t=7739
"if it is the relay then the EML wont light up with the ignition" ???
^^
My valver brings all the boys to the yard, dam right its cammed and carbed, dam right it pops and farts, I would show you but the fuker won't start!
- planetc
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Re: random missfire ...
If the voltage remains fine at the pump right up until it cuts out then the relay is fine. If it's fine standing still and only cuts out after time actually driving then my money would be on something floating in the tank and clogging the pickup. I had a similar thing on my capri, and have had a couple of older cars with the same issues roadside too. You could rig an alternative feed to the pump with a can of fuel and a long piece of fuel hose to confirm. Otherwise the pump itself sounds likely. My capri would drive between 8 and ten miles then lose fuel pressure following each clean out of the tank, but once the problem returned it would idle all day long but as soon as I moved the car it would die. I never did find the cause, I replaced the tank and pump when I got fed up with flushing the tank. The ones I have had roadside have been old cars with mechanical pumps on the engine, so no roller vanes and I have blown back down the lines to dislodge the offending item.
"No the temperature gauge doesn't work........
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"
we've driven 150 miles today........
the heater went cold last Thursday........
they check the level when it's serviced don't they?"