redtop studdering under boost once warm - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

scote2583 · 02-06-2011, 11:06 AM

car is a 93 240sx with a redtop sr 20 in it, before i parked it for the winter it was showing the problem..... when i first start and drive the car for the first 5 mins its fine, runs like a champ but it seems that once it gets warmed up it falls flat on its face when i get on it, it studders and backfires, i dont really wanna replace stuff that i dont have to so looking for ideas here first. my original thought is a bad o2 sensor, please help

jacobs13 · 02-06-2011, 11:09 AM

Im pretty sure its your timing. Warm up the car and then set your timing with the proper procedures

scote2583 · 02-06-2011, 11:11 AM

the car is running on stock ecu with no extra tuning , was running about 13lbs of boost, bought car in august ran great up until October, the reason I'm thinking o2 is that the o2 wire looks a little melted from contacting the manifold, it doesn't look melted all the way through though so not really sure

scote2583 · 02-06-2011, 11:12 AM

what would have caused the timing to go off? and where do I find the proper procedures

Sileighty_85 · 02-06-2011, 11:55 AM

check ECU for Codes almost sounds like the Coolant Temp Sensor

JayZeeSILVIA · 02-07-2011, 07:30 PM

could be coolant temp or o2 sensor. the ecu ignores the o2 sensor until it warms up. replace the wire on the o2 sensor and see if that helps. also if i remember correctly you should have between 0-5v on the coolant sensor depending on measured temp.

scote2583 · 02-20-2011, 01:09 PM

weather got nice out and roads were clear so I took the car out an re-evaluated my problem and figured out that it does it right away sometimes when I go WO throttle, my friend who was in the car with me said it sounds exactly like his did when the plugs were toast, so ordered some new plugs and hoping that it is just a simple stupid problem

spartanmisfit · 02-20-2011, 04:25 PM

have you checked for boost leaks? Have you checked for vacuum leaks?

scote2583 · 02-20-2011, 06:13 PM

Quote:

Originally Posted by spartanmisfit

have you checked for boost leaks? Have you checked for vacuum leaks?

yeah, when problem first started that was first check, waiting for my NGK's to get here hoping thats the problem

02-06-2011, 11:06 AM	#1
scote2583 Join Date: Feb 2011 Location: Sheboygan Wi Age: 38 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	redtop studdering under boost once warm car is a 93 240sx with a redtop sr 20 in it, before i parked it for the winter it was showing the problem..... when i first start and drive the car for the first 5 mins its fine, runs like a champ but it seems that once it gets warmed up it falls flat on its face when i get on it, it studders and backfires, i dont really wanna replace stuff that i dont have to so looking for ideas here first. my original thought is a bad o2 sensor, please help

02-06-2011, 11:11 AM	#3
scote2583 Join Date: Feb 2011 Location: Sheboygan Wi Age: 38 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	the car is running on stock ecu with no extra tuning , was running about 13lbs of boost, bought car in august ran great up until October, the reason I'm thinking o2 is that the o2 wire looks a little melted from contacting the manifold, it doesn't look melted all the way through though so not really sure Last edited by scote2583; 02-06-2011 at 01:09 PM..

02-06-2011, 11:55 AM	#5
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	check ECU for Codes almost sounds like the Coolant Temp Sensor __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

02-07-2011, 07:30 PM	#6
JayZeeSILVIA Join Date: Feb 2011 Location: Florida Age: 31 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	could be coolant temp or o2 sensor. the ecu ignores the o2 sensor until it warms up. replace the wire on the o2 sensor and see if that helps. also if i remember correctly you should have between 0-5v on the coolant sensor depending on measured temp. __________________ SKUNKWORKZ BUILT

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02-06-2011, 11:09 AM	#2
jacobs13 Zilvia FREAK! Join Date: May 2009 Location: Long Beach Age: 29 Posts: 1,061 Trader Rating: (27) Feedback Score: 27 reviews	Im pretty sure its your timing. Warm up the car and then set your timing with the proper procedures

02-06-2011, 11:12 AM	#4
scote2583 Join Date: Feb 2011 Location: Sheboygan Wi Age: 38 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	what would have caused the timing to go off? and where do I find the proper procedures

02-20-2011, 01:09 PM	#7
scote2583 Join Date: Feb 2011 Location: Sheboygan Wi Age: 38 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	weather got nice out and roads were clear so I took the car out an re-evaluated my problem and figured out that it does it right away sometimes when I go WO throttle, my friend who was in the car with me said it sounds exactly like his did when the plugs were toast, so ordered some new plugs and hoping that it is just a simple stupid problem

02-20-2011, 04:25 PM	#8
spartanmisfit Zilvia FREAK! Join Date: Jul 2008 Location: East Lansing, Michigan Posts: 1,332 Trader Rating: (18) Feedback Score: 18 reviews	have you checked for boost leaks? Have you checked for vacuum leaks?