My poor little Kali has a bit of a cough low down in the rev range and the occasional backfire out of the ITBs. this is currently combined with a high idle which means a constant burble when the throttle is off which means it sounds a little bit like I'm pining for my teenage years...
I've swapped coils around (2 off, still misfires, swap the other 2, still misfires) and I've got some new plugs coming.
I've checked the throttle cable and it doesn't feel tight, you can hear the roller clack into closed position when pedal released. is there something I can check with OBD? it's running at about 1.5k revs.
any ideas before I ship it off to Rob?
J
What model/engine are we discussing?
JV
2006 R400D
UFO7 WTF? , UberNiche printed stuff
Do you know someone with the MBE 985 cable for connecting the diagnostic port to a laptop running Easimap? That's the surest way way to examine what the various sensors are telling the ECU.
Is the misfire confined to a particular cylinder? If it's #1 (the most common on a Duratec IME), check the coil-on-plug wiring where it enters the connector. Fractures are quite common in that area. Also check the connector terminals for arcing -- any black discoloration visible? If so, pull off and replace the connector several times (20 or so) to clean the surfaces.
1500rpm is certainly a fast idle. It should be around 900.
JV
I don't have one I'm afraid. I don't know how to find out which cylinder it is either. I'll double check the coils.
I don't know anyone with an MBR 985. I've asked my local groups whatsapp group so we'll see if that helps.
otherwise I'll have to see if anyone has one that they can post out
cheers John
J
UFO7 WTF? , UberNiche printed stuff
To find out which cylinder is misfiring, you really need a digital pyrometer aimed at the primaries. Failing that, you can (carefully and very briefly!) touch each primary in turn with a wet finger.
Normally, I could lend you my MBE985 (listed in the Equipment for Loan Register) but I'm abroad at the moment. For info, there's another one in the Register. Alternatively, you could buy one from SBD Motorsport, but they're not cheap.
JV
ok. I'll go swap the plugs and see if there's still a misfire and dig my pyrometer out. it only really seems to stutter badly at low revs. makes me wonder if it is actually a misfire... I was fine keeping up with other R400s/R500s on monday :D
I've emailed Spuddy on the register. we'll see if they're active.
cheers again John.
J
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Compression test later this arvo.
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That looks nasty. It certainly would explain your misfire. I take it the missing bit of electrode is no longer in there?
is that the standard TR6AP-13 plug (FoMoCo/NGK)?
"arvo"??
JV
"arvo"??
Afternoon: Australian English and rarely spotted elsewhere.
Jonathan
seriously? you've never watched neighbours? :D
in the end there were 2 tips missing. I've replaced them with NGK TR6AP-13 I think the old ones were the same.
I checked the bores and they looked ok. I compression tested at 160 150 130 125 from the back with broken tips on 1 and 4. don't know if that is good or bad.
a few people have suggested that it's down to too hot. is it possible I should be doing something about this?
obviously the car gets a hammering, I don't generally run for more than 20 mins on the track
do I need to fit iridium plugs?
still got to get to the bottom of the high-idle. that hasn't been fixed. (the misfire has)
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