Page 1 of 1
Missfire on GTiR
Posted: Tue Mar 01, 2011 4:20 pm
by mario_200sx
Hey guys, I'm still sitting with a missfire on the GTiR!
Its got a SR20 motor with a distributor. I was told to run BCR8ES plugs but I can't find any! Running BCPR6ES at the moment as this is what we bought the car with.
Any ideas for resolving the missfire? Running stock boost! With forged pistons
Posted: Tue Mar 01, 2011 4:22 pm
by mario_200sx
Oh yes, it only happens when car is at operating temperature and as soon as you get to 3000RPM
Posted: Tue Mar 01, 2011 4:26 pm
by rat
why such cold plugs?
Boost below 1 bar bcpr6es over 1 bar bcpr7es
Posted: Tue Mar 01, 2011 4:30 pm
by djtreble
Have you cleaned the AFM with some carb cleaner and checked all pipes for leaks?
Posted: Tue Mar 01, 2011 4:31 pm
by mario_200sx
That's what I am running now.
So what else can I look at?
Posted: Tue Mar 01, 2011 4:33 pm
by mario_200sx
djtreble wrote:Have you cleaned the AFM with some carb cleaner and checked all pipes for leaks?
Yip checked and done
Posted: Tue Mar 01, 2011 4:40 pm
by djtreble
Checked timing with timing gun?
Checked the coilpacks? Checked the plugs for the coilpacks?
Posted: Tue Mar 01, 2011 4:45 pm
by mario_200sx
If it was the coils wouldn't it have done it from start up?
Posted: Tue Mar 01, 2011 4:46 pm
by djtreble
No they can be affected by heat, see if you can't find someone with known working ones and test them...not sure if the 200's SR coilpacks fit?
Posted: Tue Mar 01, 2011 5:13 pm
by mario_200sx
These motors don't have coilpacks, so only the NA sentra, don't know if that's the same however!
Posted: Tue Mar 01, 2011 5:15 pm
by djtreble
Ah ok, yeah they would use the dizzy (hence the reason for the difficulties fitting these to the S-body)
All I can suggest is testing these with know working replacements.
Posted: Thu Mar 03, 2011 7:32 pm
by BigKriss
Are your plug wires resister type wires ? Ie: are they suppressed or are they copper core or "wire" wires ?
If wires, do they have additional suppressors fitted at the plug end ?
A "R" in the plug nomenclature indicates a resistor plug . Having all this impedance in the system can kill spark in an engine.
Total impedance should not be more than 4 K Ohm in total.
If your wires are suppressed, try NGK B6/7es plugs, these are non resistive AND do not protrude . "P" stands for a protruding electrode.
As an old school Lancia Intergrale and Alfa Turbo guy I played quite a lot.
My 2c worth..
Posted: Thu Mar 03, 2011 10:57 pm
by smoothedgp
[quote="BigKriss"]Are your plug wires resister type wires ? Ie: are they suppressed or are they copper core or "wire" wires ?