Sputtering under hard acceleration
#1
Rennlist Member
Thread Starter
Sputtering under hard acceleration
Background: 991.2 with m660 Tial turbos, headers, sport cats, tuned by M Engineering on E40 on Cobb. 40k miles on car now.
I’ve been noticing more and more that my car will randomly sputter under moderate to hard acceleration when in gears 3,4,5. No other issues that I’ve noticed. This sounds and feels like spark blowout or coils. This was the same symptom I had with my previous turbocharged Mr2 and after changing the spark plug wires the sputtering went away.
I searched and couldn’t find much regarding high powered 991.2 and spark plugs. Like for instance running cooler plugs or changing the gap. Also when should the coils be changed out. I’m thinking it’s an ignition problem based on my previous experience. Spark plugs were changed at 30k miles.
I’ve been noticing more and more that my car will randomly sputter under moderate to hard acceleration when in gears 3,4,5. No other issues that I’ve noticed. This sounds and feels like spark blowout or coils. This was the same symptom I had with my previous turbocharged Mr2 and after changing the spark plug wires the sputtering went away.
I searched and couldn’t find much regarding high powered 991.2 and spark plugs. Like for instance running cooler plugs or changing the gap. Also when should the coils be changed out. I’m thinking it’s an ignition problem based on my previous experience. Spark plugs were changed at 30k miles.
Last edited by Dark_horse; 01-09-2024 at 07:54 AM.
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subaru335i (04-09-2024)
#3
Three Wheelin'
Pull codes first. Could be bad gas, gas filter, etc. Turbos are hard on plugs. With a tune even more so. If you change the plugs doing the coil packs is common since it is no more labor.
#5
Rennlist Member
Thread Starter
Only spark plugs were changed not the coil packs. Also there are no codes that come up. Data logging and sending it to M Engineering is a good idea and something that I’ll do first.
#6
Had/have same issue in higher gears and lower RPMs (same mods as you) . M engineering as well. . Was a misfire , and was not in all rpms or gears so likelihood of coils/plugs is low and might be a tuning issue. (Plugs new , 11k miles total on car)
my issue isn’t resolved.
let me know what you get on your end
my issue isn’t resolved.
let me know what you get on your end
Last edited by doctj; 01-10-2024 at 12:53 PM.
#7
Rennlist Member
Thread Starter
Had/have same issue in higher gears and lower RPMs (same mods as you) . M engineering as well. . Was a misfire , and was not in all rpms or gears so likelihood of coils/plugs is low and might be a tuning issue. (Plugs new , 11k miles total on car)
my issue isn’t resolved.
let me know what you get on your end
my issue isn’t resolved.
let me know what you get on your end
Will keep you posted. I’ll try out a few things.
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#9
Rennlist Member
Thread Starter
The times it did happen was when it was cold out so maybe that has something to do with it.
#10
There weren’t any colder plugs available last change so i’ve always run OEM gapped down.
#11
Rennlist Member
Thread Starter
Any colder plugs available now?
#12
Rennlist Member
Wouldn't it be showing a code if it's missing. I would see if anyone local has a OBD reader or even your local Autozone should be able to read it.....
#13
Rennlist Member
Thread Starter
#14
Rennlist Member
Interesting now that we know it's not "having issues" at least that the ECU is identifying. I wonder if it's bad gas then or even gas with a lot of condensation in it? Interesting!!!!
#15
None that I have heard of. If you find one, be sure and report back.
I’m on TiAL M800’s with E40 tune and still no issues with just fresh OEM gapped down.
I over service my car due to tracking. So this is my third set of plugs in 37,000 km’s. (Never had to, just more of a whilst we are in there deal.)
I’m on TiAL M800’s with E40 tune and still no issues with just fresh OEM gapped down.
I over service my car due to tracking. So this is my third set of plugs in 37,000 km’s. (Never had to, just more of a whilst we are in there deal.)