dhdev
Member
Registered: 22nd Dec 05
Location: Midlands
User status: Offline
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My Nova has developed a misfire under load. On partt throttle the engine seems fine, and will accelerate through the rev range. However as soon as I apply a more generous helping of the go pedal, it splutters so badly I have to back off. So far I have checked:-
Plugs - BCP7EVX (SBD recommended) all gapped properly and showing only slight carbon fouling (as a result of the problem as opposed to the cause I believe)
Leads - Magnecore blue silicon 8.5mm jobbies, all in excellent condition
Throttle pot - Good stable reading at idle and seems to be linear and stable right up to WOT (tested with multimeter)
Throttle body balance - Checked the bodies to ensure that there was no imbalance.
i don't believe it is due to under fuelling (bad injectors, pump on its way out etc) due to the carbon fouling of the plugs (excessive fuelling)
Between myself and Lee303 we have narrowed it down to possibly the coolant temp sensor being dodgy and tricky the ECU into thinking its cold all the time.
Does anyone else have any likely causes of failure? The misfire is not rev related (so unlikely crank sensor).
Engine spec is basically throttle bodied C16XE (taper bodies), SBD ex manifold, Omega pistons, cream injectors, ported head (std valves), hyd lifters, mild cams.
Any help greatly appreciated, thanks.
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birchieboy
Member
Registered: 18th Jan 06
User status: Offline
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what managment?
possibly the map?
[Edited on 13-06-2008 by birchieboy]
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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get your laptop on it to check the coolant temp sensor. be the easiest way.
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dhdev
Member
Registered: 22nd Dec 05
Location: Midlands
User status: Offline
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Sorry should have said, it's MBE management. I doubt it'll be the map as its been fine since it was mapped probably 3yrs back 
Broster, I don't have a lead at the mo, Olly Hewitt has offered to pop over later to help diagnose the prob with his lead.
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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I was going to post what mark said, get it plugged in and see the live readings.
coilpack? what type are you using?
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dhdev
Member
Registered: 22nd Dec 05
Location: Midlands
User status: Offline
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Laptop plugged in and all was fine. So DIS pack was the culprit, checked with the one off Olly H's motor.
Where's best to get a new one from? How much and which is the best type? I was using the SBD supplied one.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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what type of plug does it have on it? is it pug, ford of vauxhall?
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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chrex has a coil/dis pack spare?
if you need one,
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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probably vaux ecotec 2.0 from SBD. can get them from your local motorfactors for around 35 quid.
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