Escort rs1600i misfires at low revs
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Virgin
Joined: Feb 2016
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From: Washington
Escort rs1600i misfires at low revs
ESCORT rs1600i (running twin coils) starts ok , drives ok when cold. When it warms up it misfires at low Revs but stops at high revs. Changed coil , leads , plugs, checked pipes, cleaned throttle body , plenum flap. My heads done in. Anyone know how to check to see if the auxiliary air device etc is working?
Thread Starter
Virgin
Joined: Feb 2016
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From: Washington
Don’t think so. I think it’s something to do with a sensor on mfi system ,auxiliary air device, fuel shut off valve , cold start etc causing overfueling. Don’t no how to rule them out. It ticks over / rev ok on the drive , but soon as you take it out ! It stars of as a slight miss as low revs , then a few miles later it starts to miss like fook till after 2500 rpm ,, then it takes off longer you drive it the worse it gets.
PassionFord Post Whore!!
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From: Colchester,essex
AAV is easy to inspect, wait till the engine is warm (properly warm not "idled from cold for 10mins warm"), pop off a pipe and shine a torch down - the half moon should be as good as closed. If it was stuck open your idle would be sky high anyway.
CSV - you'd be bogging down or smell the fuel if it was stuck open, its unmetered unlike the main injectors.
Fuel shut off device you should be able to hear working - or put your hand on it, rev up and over 2.5k (i cant remember the actual cut off - think its like 1.7k but higher will ensure its triggered), let off and you should feel it click. Again if it failed shut - it will not be letting any air pass and will have no influence on mixture, if its failed open, you will be getting air bypass the throttle but again i'd expect a raised idle.
I'd be looking at the WUR (warm up regulator) from a troubleshooting perspective - the part everyone overlooks on K-Jet. Monitor pressure from cold through the warm up cycle. I notice you dont mention touching your fuel filter in your list- it could be as simple as that also!
CSV - you'd be bogging down or smell the fuel if it was stuck open, its unmetered unlike the main injectors.
Fuel shut off device you should be able to hear working - or put your hand on it, rev up and over 2.5k (i cant remember the actual cut off - think its like 1.7k but higher will ensure its triggered), let off and you should feel it click. Again if it failed shut - it will not be letting any air pass and will have no influence on mixture, if its failed open, you will be getting air bypass the throttle but again i'd expect a raised idle.
I'd be looking at the WUR (warm up regulator) from a troubleshooting perspective - the part everyone overlooks on K-Jet. Monitor pressure from cold through the warm up cycle. I notice you dont mention touching your fuel filter in your list- it could be as simple as that also!
Thread Starter
Virgin
Joined: Feb 2016
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From: Washington
Thanks for that.
I asumed the fuel cut off on the side of air box was working as both lights come on the dash when you let off throttle , but had a listen and can’t hear a click. Tried 2 more and they don’t click, (never checked lights) , is there anyway of checking wires are working ie test light etc I also have a spares for the other sensor valves, is there anyway of checking these before I fit them ? It’s had a new fuel filter and service ,
I asumed the fuel cut off on the side of air box was working as both lights come on the dash when you let off throttle , but had a listen and can’t hear a click. Tried 2 more and they don’t click, (never checked lights) , is there anyway of checking wires are working ie test light etc I also have a spares for the other sensor valves, is there anyway of checking these before I fit them ? It’s had a new fuel filter and service ,
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Thread Starter
Virgin
Joined: Feb 2016
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From: Washington
I’ve cleaned up sensor , tried another 2 sets of coils , one of which is off a car that runs. Another ecu. It ticks over no problem on drive , soon as I drive it , it starts spluttering after about a mile , then gradually gets worse and worse , then it starts misfiring running on 2pots till about 3000rpm , then backfired and takes off like stink.
Virgin
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From: Rayleigh
[QUOTE=Sietyneandwear;6782740]
ESCORT rs1600i (running twin coils) starts ok , drives ok when cold. When it warms up it misfires at low Revs but stops at high revs. Changed coil , leads , plugs, checked pipes, cleaned throttle body , plenum flap. My heads done in. Anyone know how to check to see if the auxiliary air device etc is working?
I have the same issue tried all I can think of. Did you get a resolution as I would like to know? Cheers
Thread Starter
Virgin
Joined: Feb 2016
Posts: 11
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From: Washington
[QUOTE=Lloris22;6819472]
put another ecu in and it’s been ok mate. Touch wood
ESCORT rs1600i (running twin coils) starts ok , drives ok when cold. When it warms up it misfires at low Revs but stops at high revs. Changed coil , leads , plugs, checked pipes, cleaned throttle body , plenum flap. My heads done in. Anyone know how to check to see if the auxiliary air device etc is working?
I have the same issue tried all I can think of. Did you get a resolution as I would like to know? Cheersput another ecu in and it’s been ok mate. Touch wood
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