S14 SR20det Low compression misfire and running rich.

Got questions about your Nissan? We're here to help, and it's FREE!
Doogiel18
Posts: 4
Joined: Sun Apr 15, 2007 9:06 am

Post

I have looked everywhere and I cant seem to find the cause of all my symptoms. I just did the swap 3 weeks ago and it all went great it started right up and ran like a champ. I broke the motor in with 500 miles and changed the oil. Then took it on a short trip to Virgina beach about 120 miles then all of a sudden. What I got S14 Sr20det in a S14 kioki full exhaust turbo back, stock turbo, front mount, stock ecu, hks bov, blitz boost controler, blitz timer, walbro 255, ngk iridiums new,

Its got a misfire and wont start when its hot unless I give it a lot of throttle then it finnaly starts and blows white fuel rich smoke. I pulled the plugs and they are wet as hell with fuel. When I drove back I checked the spark plug gap and the compression and it was low as hell all the cylinders read 120-125 psi thats real low. My buddy said pull the injectors and test it again with some oil in the cylinders. but will that really matter. When this started it makes a strange pigeon sound (woo woo qoo) yeah it sounds stupid but yeah it makes that sound from the intake when it throttles down which leads me to believe its a vavle or cam issue like the valves are staying open to long. I checksed the timing and set it at 15 deg tdc as fsm states but it had a small misfire before I did timing so I dont know what it could be. Plus the misfire or sounds like one. I checked for vaccum leaks and boost leaks and cant find any. WOT it runs great picks up boost fast blows off fine. I hope someone out there can help if at all possible.
Modified by Doogiel18 at 9:47 AM 9/22/2007


bees
Posts: 38
Joined: Sat Jan 13, 2007 9:53 pm

Post

did u ever figure out what was wrong?

Klits562
Posts: 722
Joined: Fri May 15, 2009 8:36 am
Car: white s13 coupe
Contact:

Post

when you said the plugs are WET are you certain it was fuel and not water/coolant? Might be a blown Head gasket, that would account for your loss of compression, wet plugs, and white exhaust smoke.
The compression test your friend told you to do with a little oil the cylinder is a wet comp test. The oil helps seal any gap between the Piston rings and the cyl wall. If you have toasted Piston rings then thats were all your compression is going, if you fill the gap with oil and your comp goes up even slightly then its your piston rings. If thats not the case it might be a burnt or stuck open valve or blown head gasket.

User avatar
Dattebayo
Posts: 33288
Joined: Sun Aug 25, 2002 10:04 am
Car: 2004 Nissan Frontier Desert Runner
Location: NE DC

Post

This thread is from 2007.
Made by a guy who has 4 posts.
Get a clue fellas.


Return to “Nissan Online Mechanic”