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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 05-18-2005, 02:57 PM   #1
dephrag
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Running Rich and Bad Smells..

Had my SR running for almost 2 years now.. Runs great, very fast, but just a couple hopefully minor issues.

On a cold startup - Trying to move without warming up for 5 mins will result in the engine choking, idles ok, but press the gas lightly and it starts to choke and die. However giving it alot of gas will manage to get it going. Once the Nissan dealer said it needed a bigger mafs cause it couldn't provide enough air. And also cause from a stop it takes a sec for the car to kick in from pressing the gas.. But once it's going, it's great.

Smells - While I'm driving I quite often get a gas smell in the interior. Not a big deal. I know I"m running rich because the car backfires a little and pops alot. But Lately there is a TERRIBLE smell.. Smells sorta like a just ran into a cloud of trasnport smoke mixed with alot of dirt. It's just a very bad 'dirty' smell, NOT gassy. Could that be a result of running to rich?

Engine Code: For the longest time it's been throwing a TPS error code. (55 I think?) I read a thread on checking TPS voltages, but I have no idea what this looks like or how to do this, but I did just run out and buy a multimeter with the hopes I could do this.

Any assistance is GREATLY appreciated! Thx!
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Old 05-18-2005, 04:49 PM   #2
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what mods? just slightly important info there....

sounds like you're indeed running WAY rich.
What's your fuel pressure? Does the pump keep running after you shut off the car? Do you have the stock 240 pump or an upgraded one? adjustable FPR?

etc etc etc etc...
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Old 05-18-2005, 05:48 PM   #3
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Simply a Blacktop S13, FMIC, Walbro pump, and 3" Exhaust.

I don't know what my fuel pressure is.. I don't have a gauge...
and I'm pretty sure the pump shuts off when I shut off the car.

I was thinking about getting a couple gauges to make sure the car is running optimally. What would you reccomend? Fuel Pressure or Air/Fuel ? And maybe Oil Pressure?
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Old 05-18-2005, 06:03 PM   #4
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Quote:
Originally Posted by dephrag
Simply a Blacktop S13, FMIC, Walbro pump, and 3" Exhaust.

I don't know what my fuel pressure is.. I don't have a gauge...
and I'm pretty sure the pump shuts off when I shut off the car.

I was thinking about getting a couple gauges to make sure the car is running optimally. What would you reccomend? Fuel Pressure or Air/Fuel ? And maybe Oil Pressure?
Walbros are notorious for making people run rich (myself included). I'd recommend getting any electric fuel pressure gauge. I like greddy myself, but autometer would work fine and cost half as much. A/F gauges are worthless for our cars unless they're wideband, search for A/F gauges in you want to know the details, it's been discussed to death. Oil pressure is nice, but may give you bad self esteem odds are, your pressure will be lower than you'd like, yet be just fine I'd just go with FP gauge, boost gauge, and maybe water temp if you dont' have an upgraded radiator.

oh ya, don't forget about an adjustable FPR so u can fix your original prob!
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