Engine stuttering when cold

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mihalyn90
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Engine stuttering when cold

Post by mihalyn90 » Sun Oct 27, 2019 4:04 pm

So now and then my car behaves heretic...

Today I had a short drive... 3rd gear slow speed and when I wanted to accelerate it has hesitating and had a lot of backfires on the exhaust... Why is this?

Only when engine is cold
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Ford Puma 1998 - 1.7L

Magnaflow Core Competition backbox + TIP
Bilstein B8/B6 30mm drop
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zinc2000
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Engine stuttering when cold

Post by zinc2000 » Sun Oct 27, 2019 5:13 pm

Normally hesitation/misfire is down to coil pack being faulty, suggest you check this first
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Wild E. Coyote
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Engine stuttering when cold

Post by Wild E. Coyote » Fri Nov 01, 2019 11:44 am

I would start at basics: check the sparkplugs and ignition cables for wear. After that, coil pack. After that, fuel delivery. Air filter. Lambda probe. Clean MAF.
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mihalyn90
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Engine stuttering when cold

Post by mihalyn90 » Fri Nov 01, 2019 11:33 pm

sparkplugs are new, cables must be checked... air filter new, fuel filter new :) maf clean... so cables and lambda...

but only when cold... so :(
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Ford Puma 1998 - 1.7L

Magnaflow Core Competition backbox + TIP
Bilstein B8/B6 30mm drop
Xplod 1100W woofer
Complete rebuild HERE

DOH
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Engine stuttering when cold

Post by DOH » Sat Nov 02, 2019 11:36 am

This sounds that the engine is running lean when the engine is cold.
With regards to the Ignition leads, there is no harm in doing a resistant test on them, but if you have a faulty lead that would also affect the performance when it's hot.
This problem when its cold, may be caused possibly by either of the following:
1)An air leak around where the inlet manifold to head joint gasket , this can be identified with a can of carb cleaner.
2) Check the small cluster of vacuum hoses to the right of the dipstick, as they have been known to split and also maf hose to throttle body joints for airleaks with carb cleaner
3) Ensure the lambda sensor is still tight as they have been known to work loose and suck air in if it has recently been removed.
4) Clogged injectors( run some injector cleaner concentrated through the tank with the fuel) or air leaks around the injector seals . (to identify if theses are ok, test with carb cleaner).
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