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14th October 2021, 22:06 | #1 |
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MG ZT-T Join Date: Jul 2020
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Cold start misfire ZTT 1.8T
A little while ago my ZTT started misfire upon cold starts! It will run on 3 for about 15-20 seconds before the last one wakes up! Having read some forum thread about similar issues I immediately ordered a black Viton inlet manifold gasket and full ignition set with spark plugs and leads and coils from DMGRS and swapped everything as soon as it arrived but it made no difference! Funny thing is it drives and pulls absolutely flawlessly 🤔It seems worse if it’s partially humid outside! There’s no sign of head gasket failure ore compression loss and there’s no fault codes stored so now I’m right confused 🤷NAUGHTY WORD-♂️
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15th October 2021, 08:56 | #2 |
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ZT260 #243 (resting) Join Date: May 2010
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Is it a plastic inlet manifold? They can warp very slightly out of shape and replacing the gasket doesn't stop it weeping.
What gap did you set on the new plugs? 1mm is the manufacturers recommendation but taking them down to 0.7mm will improve the idle and response. |
15th October 2021, 09:42 | #3 |
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Yes it is plastic manifold! I didn’t check the gap on the spark plugs as I thought buying them from a specialist they should be okay 🙈They are Denso plugs by the way! I’ll check the gap when I get home!!
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15th October 2021, 10:24 | #4 |
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ZT260 #243 (resting) Join Date: May 2010
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1.8s turbo and N/A run much better with a smaller gap than the recommendation.
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15th October 2021, 10:55 | #5 | |
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Quote:
Both points valid, but as the the misfire appears to be consistent for first 15-20 on engine start up I would revisit and check your inlet manifold for warping as is consistent with coolant passing into the inlet port , Have you had to top up the coolant level ? Plug gaps set at 0.7 mm does improve running and appears more critical for turbo than the nasp Last edited by TourerSteve; 15th October 2021 at 12:06.. |
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15th October 2021, 18:30 | #6 |
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Yes but I don’t know if that’s the reason as I’ve had various types of coolant leaks to fix over the last months! I’ve not seen any excessive smoke from the exhaust either! This doesn’t happen everyday either! Today when I was going home from work there where no misfire on start up. Only seemed a bit hesitant for a couple of seconds. But I’ll check the plug gap and sort the last little coolant dripping and monitor the situation!
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