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2001 s2000 random misfire CEL:p1339

2001 s2000 random misfire CEL:p1339

Old 02-13-2009, 03:06 PM
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2001 s2000 random misfire CEL:p1339

i am currently having problems troubleshooting my 2001 s2k cant figure out why the car is throwing a random misfire cel....


i have checked for spark in all cylinders and there is spark....
ran compression check on motor... 215 across the board...

just to note this motor is not the original swap that had came from the factory...
bought this motor from jdmcorp in richardson tx.....

car runs and drives ... but cant pass emissions for greensheet
and no you cant cheat emissions on new cars!\

i did change the spark plugs with new NGK's
the coil packs are working on the car....

hrmmm very tired of troubleshooting need help from some of my fellow honda-tech's

note: i onlypump the best gas 93octane premium

any help will be apreciatedd thanks !!!!!
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Old 02-13-2009, 03:59 PM
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I was throwing P0300 through P0304 and P1399. Couldn't figure it out. I did so much research on all 3 S2k sites. There are so many things it can be. This last weekend I did a valve adjustment (as per a mechanic friend's recommendation). I have not gotten a CEL since then (and I'm keeping my fingers crossed). I used some dielectric grease on the coil packs where they connect to the plugs, which were devoid of it. I also did a MAP whack. I think the thing that did it was the adjustment. All of my intake valves were loose and exhausts were tight. I didn't notice that my car was running bad until I feel how well it runs now.

There are many things to check and I did what I could with what I had. Not to say that valve adjustment is what you need, but it helped me. You have to clear the codes before you start anything to see if they come back on after the procedure that you do. If you do a valve adjustment, take your time to get it right. Don't take it to the dealer, they won't be as **** as you might be about getting it right. If you've never done it before, get someone to help you that has.

Also, if you have some low profile ramps (like the plastic composite ones from Kragen). It's a lot less back-breaking to have the front of the car higher. I wish I had done that before I did the adjustment. Use angled feeler gauges and a valve adjustment tool would be a big help.

See the "How to" pages on s2kca.com and copy them for reference. That's what I did. And when something tells you to torque to Newton/meters, Google what that will be in foot/pounds (ft/lbs) cuz they're not the same.

Good luck and let us know what you find.

Jimbo

My S is an '01 with 73k on the clock.

Last edited by Dr. Jimbo; 02-13-2009 at 04:49 PM.
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Old 02-13-2009, 04:04 PM
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215psi?

mine was doing ~250 on all cy linders
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Old 02-13-2009, 08:20 PM
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HRMM I HAVENT DONE

I HAVENT DONE A VALVE ADJUSTMENT YET... I SHOULD LOOK INTO IT ... MAYBE TOMORROW..... I REALLY NEED TO GET THIS SOLVED ... GRRR I HATE JDM SWAPS ANY MORE SUGGESTIONS??? I WILL HAVE AN UPDATE.... THANKS
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Old 02-15-2009, 07:48 PM
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i have done check the valve clearance and its at spec....i have check sparkplug gap... its good, i have map whacked and still doing the same thing ... grrr need some help
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Old 02-15-2009, 08:59 PM
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Check s2kca for more ideas. It could be injectors, burnt or bent valves, fuel pressure, ECU or any of a number of things. Bummer it wasn't the valve adjustment like it was with mine. One of the other things you might want to do is a leak-down test. I never did one but I think is to diagnose bad valves.
Someone else mentioned that they had a bad MAP sensor and that gave them the misfire codes and decreasing gas mileage. There are so many things it could be, I wish you luck. Do what you can on your own, then find someone that you can trust to take care of the rest.
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Old 02-16-2009, 10:49 AM
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Anybody replace the fuel filter yet? ...(will generate random misfire codes if partially blocked)
Back pressure at the cat should also be checked....(also will generate random misfire codes if it's on it's way out.)


good luck.
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Old 02-17-2009, 12:13 PM
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The fuel filter is a sock over the fuel pump in the gas tank. I'd have the fuel pressure checked where it goes into the fuel injection. If that's okay, there probably isn't blockage at the sock. Checking the fuel pressure is easier that ripping your trunk apart to get at the pump.
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Old 02-17-2009, 12:52 PM
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Originally Posted by Dr. Jimbo View Post
The fuel filter is a sock over the fuel pump in the gas tank. I'd have the fuel pressure checked where it goes into the fuel injection. If that's okay, there probably isn't blockage at the sock. Checking the fuel pressure is easier that ripping your trunk apart to get at the pump.
uhh

thats the fuel sock

the fuel filter is post pump
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Old 02-17-2009, 12:56 PM
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i stand corrected

Strainer Kit - In Tank This vehicle does not have an in-line fuel filter between the fuel tank and the engine. Use this filter set when replacing the fuel strainer located inside the fuel tank, which is the only fuel filter on this vehicle.

what the hell??
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