Misfire
08-23-2018, 06:55 AM
#16
Instructor
Join Date: Jan 2013
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Take out your spark plugs and check your gap. When your gap is to much thats when misfires happen. .028 should be good for you right now. Your probably .036 which is to much.
Its your spark plugs.
Its your spark plugs.
09-12-2018, 06:18 PM
#19
7th Gear
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UPDATE
Investigate misfire on cyl 1,2,3.
>> Found Vario cam solenoid bank1 faulty and not functioning so replaced.
>> Slight misfire still persistent.
>> Renewed vario lift solenoid bank 1.
>> Replaced all 6 spark plugs.
>> Check fuel pressure all ok.
>> Replaced 3 coils on bank 1 to no avail so removed.
>> Check with plug in test light activation of vario lift solenoid.
>> Checked earth for coils. ok
>> Renewed fuel filter and topped tank up with fresh fuel.
>> Swapped vario lift solenoids side to side and metal retaining brackets side to side to no avail.
>> Removed Vario lift solenoids and fuel pump fuse and cranked engine until oil emerged out of both holes.
>> Refitted solenoids and misfire gone but come back after 1 heat cycle.
>> Re-fitted vario lift solenoids and fitted new retaining bracket on bank1. Misfire not as bad but still present.
>> Road tested car and all tested ok no misfire present, Re-tested on 2 separate occasions and all tested ok.
>> Give to customer to further test
Misfire is still there.
Investigate misfire on cyl 1,2,3.
>> Found Vario cam solenoid bank1 faulty and not functioning so replaced.
>> Slight misfire still persistent.
>> Renewed vario lift solenoid bank 1.
>> Replaced all 6 spark plugs.
>> Check fuel pressure all ok.
>> Replaced 3 coils on bank 1 to no avail so removed.
>> Check with plug in test light activation of vario lift solenoid.
>> Checked earth for coils. ok
>> Renewed fuel filter and topped tank up with fresh fuel.
>> Swapped vario lift solenoids side to side and metal retaining brackets side to side to no avail.
>> Removed Vario lift solenoids and fuel pump fuse and cranked engine until oil emerged out of both holes.
>> Refitted solenoids and misfire gone but come back after 1 heat cycle.
>> Re-fitted vario lift solenoids and fitted new retaining bracket on bank1. Misfire not as bad but still present.
>> Road tested car and all tested ok no misfire present, Re-tested on 2 separate occasions and all tested ok.
>> Give to customer to further test
Misfire is still there.
09-13-2018, 04:53 PM
#22
RL Community Team
Rennlist Member
Rennlist Member
Something has gone bad.
Last edited by Carlo_Carrera; 09-13-2018 at 09:14 PM.
09-13-2018, 06:53 PM
#23
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Check both banks' lambda values to be equal.
__________________
Pete
Power. Lots is good, more is better, too much is just right...
'87 951, RIP
'00 996 C2 L92U AQ / IXAA IXRB IX54 M96/7.xx G96/7.88 M030 M375 M376 M436 M476 M601 M983 ... + 991 GT3 brakes, 997 GT3 sway bars, fully monoball'd suspension, Bilstein Cup Car coilovers, do88 Big Pack ICs. 10 & 12 x 19" BBS CH-R wheels with 265/30 & 325 /30 -19 MPSC2s.
Pete
Power. Lots is good, more is better, too much is just right...
'87 951, RIP
'00 996 C2 L92U AQ / IXAA IXRB IX54 M96/7.xx G96/7.88 M030 M375 M376 M436 M476 M601 M983 ... + 991 GT3 brakes, 997 GT3 sway bars, fully monoball'd suspension, Bilstein Cup Car coilovers, do88 Big Pack ICs. 10 & 12 x 19" BBS CH-R wheels with 265/30 & 325 /30 -19 MPSC2s.