Fouled plugs after 5 minutes

For the RWD SR20DET cars! Sponsored by Wiring Specialties.
Dcasil80slider
Posts: 237
Joined: Wed Dec 07, 2005 1:59 pm
Car: 1993 240sx se sr20det fastback 5speed
Contact:

Post

sr is a 93 redtop in a 93 hatch. timing is correct all vaccuum lines are connected. the engine has 550cc injectors, 300 maf, t25 turbo, greddy fmic, apexi gt spec down pipe, solid rocker conversion, crower 272 cams, greddy piping, metal head gasket, new cas, greddy rs bov, nismo fpr, and a walbro 255 lph fuel pump and ecu is rom tuned. after about five minutes of rough running my plugs are coming out blackened and it sounds like im missing on cylinder 2 and 4. any ideas guys ????


User avatar
Koshin
Posts: 14088
Joined: Wed Feb 13, 2008 4:43 pm
Car: JP'd out Y32 Nissan Gloria GTU
750 hp '87 Buick Grand National
'63 Chevy Impala SS 327/4 speed
Location: ...in your garage stealing your wheels
Contact:

Post

when you replaced your injectors, did you happen to replace the injector o-rings as well?? You might start there....pull your rail off with the injectors attached and just turn the key (dont crank the car) see if any of them are leaking...Also, beware of your oil at this time....if they are leaking you could potentially have a lot of fuel in your crankcase..Just a suggestion

Rich

Dcasil80slider
Posts: 237
Joined: Wed Dec 07, 2005 1:59 pm
Car: 1993 240sx se sr20det fastback 5speed
Contact:

Post

the injectors are deatschwerks remans so they came with new seals. i checked my pcv today and it was stuck open with carbon and $hit so i cleaned it up but i didnt get a chance to turn it over, had to go to work. Any1 know a replacement part number for a pcv valve ?

User avatar
redtop91
Posts: 16325
Joined: Thu Sep 07, 2006 9:05 am
Car: ↑ ↑ ↓ ↓ ← → ← → B A Start

Post

Dcasil80slider wrote: Any1 know a replacement part number for a pcv valve ?
Ughhhhhhh no one ever checks the stickies! There is a sticky thread entitled "SR20DET Parts Guide (Page 2 has complete Parts Number Listing)" maybe checking there would've been a good idea? It's 11810-79E01.

The fouling is because of the ignition troubles you are having. On my SR one of the plugs was fouling because that cylinder was getting no/inconsistent spark. The coilpack harness was the culprit in my case. I'd start by diagnosing that problem then the fouled plugs will fall in line.


Return to “SR20DET Forum (rear-drive)”