rb968
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| posted on 23/5/12 at 10:20 PM |
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Westfield 1.8 Zetec idling issue when warm
The other week I posted about a friends Westfield zetec that was bogging down when under hard acceleration or at least with big throttle openings.
Well we replaced the black sooty plugs with new platinum plugs with the correct 1mm gaps and that seems to have sorted that.
However, once up to temperature you can hear the idle start to drop, then it begins to sound a bit rough then it struggles to keep going. If left it
will hunt with the revs dropping right off, almost stalling, picking back up to idle until eventually giving up the ghost.
Tonight I hooked up Easimap to the MBE 967 ECU and managed to log what was happening (until we blew a perished rubber cap on the thermostat housing
split and dumped all the coolant on the floor :-0 )
So here is the graph from the log. Sorry its not easy to read but engine is at idle, coolant temp up to 90deg which is when the panel in Easimap
turns orange (an alert?) and then the drop off in revs starts.
The arrow points to the point at which it begins to go and my dad blipped the throttle.
This is what is happening when we built up the revs up to 6k. Arrow points to engine speed trace.
The ECU is locked with a pin so I couldn't download the map. Then it started raining pink coolant on my laptop so we had to give up
Can anyone shed any light on what is happening and why the ignition advance/fuel appears to be rising once up to temperature?
Thanks for looking.
Rich
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will121
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| posted on 24/5/12 at 06:15 AM |
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I can't see graph to well as on phone, but just wondering if air temperature correction is having an effect when under bonnet temperatures rise
but notice on graph air temp seems static at 16 deg, is air temp sensor in inlet flow?
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rb968
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| posted on 24/5/12 at 07:16 AM |
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Yes there is temp sensor in the plastic airbox/ inlet after the filter. We were logging at that stage just sat in the garage with the doors open so
16deg is correct in terms of ambient temp. Bonnet was off as well.
Rich
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rb968
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| posted on 24/5/12 at 11:09 PM |
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Can anyone else help? Really want to help this mate get confidence back to use his car. Yes he could pay a small fortune to get it mapped but
don't want him to waste his cash if it's something else that might be at fault?
Rich
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mad4x4
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| posted on 25/5/12 at 06:40 AM |
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Could the soft rev limiter be set a 6K and it is cutting spark ?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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Norfolkluegojnr
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| posted on 25/5/12 at 07:46 AM |
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Does it run normally until i gets up to temp?
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will121
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| posted on 25/5/12 at 10:00 AM |
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are you using MAP for load sencing and what type of idle control? (separate idle control valve or just basic throttle stops?) from graph appears MAP
pressure rising and then altering ignition advance and fueling, is it individual throttle bodies and all ballanced up ok?
just some ideas
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rb968
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| posted on 25/5/12 at 03:27 PM |
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Thanks all. A bit more info to clarify. This is standard 1.8 zetec on standard inlet and throttle body with Westfield exhaust. Cone filter on a
plastic duct. Standard Westfield.
My understanding is limited but the issue is that when idling once up to temperature the car starts to hunt and then will eventually stall. On the
first image you can see the revs dropping off once it hits 88/90 degrees. Then the green trace which is TPS vs Speed Igntion starts to rise as does
the ignition advance until the throttle was blipped and it recovered. Normally it would hunt wildly and then stall. IT then would start up fine, run a
few minutes again then repeat.
Just to add this MBE ecu is as supplied by Westfield with the kit pre mapped for this engine.
Rich
[Edited on 25/5/12 by rb968]
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