So, I've recently rebuilt a 95 rs that's been sitting in my folks garage for a few years, car originally blew a head gasket and was laid up afterward.
Anyway, After getting all my machine work done, and replacing all the gaskets and getting the engine back in the car with everything hooked up I'm having a few problems.

1) Oil on the cyl. # 3 plug, looks like a leak into the cylinder from somewhere. This cylinder's also making next to no power.

2) Loping idle, sounds like street cams almost, feels like it too when driving. Almost no power below 2.5k, and a sudden jump and hard pull all the way to around 5.5k.

3) Plugs 1,2, and 4 all look white like they're running lean.

4) CEL codes for a pulsed sec. air injection system, and the removed EGR valve.

5) Car experiences fuel cut or something when it's warmed up and being driven at anything past 1/8th throttle. It's more prevalent the less fuel that's in the tank and the warmer the car is. I'm possibly guessing something fuel pump related there.

Now I'm no car expert by any means, so I'm open to any suggestions and I'd greatly appreciate any help offered.

start off with a compression test on all four cylinders. then check the timing. if the timing is off by a half of a tooth, it can make it lope at idle. mine does the exact same thing, and its definately the timing. also, wouldnt hurt to clean out the iac to see if that will smooth it out a bit if you already havent done so.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

Oil on Plug 3 is probably due to a bad spark plug tube seal.

Lack of power and choppy idle is likely due to the timing being off

95 Avenger 2.0 - Hahn 16g, DMS 8 injector setup, UDP, Big FMIC, HKS SSQV, MSD Coil & Wires,
ZEX Nitrous System, QTP Cut Out, Mandrel 2.5" Exhaust with cat delete, MP 60mm TB...and tons of Carbon Fiber

bad tube seal?
Like the seal between the valve cover and the head?
Isn't that still outside the combustion chamber though? Wouldn't it have to somehow make it around the crush ring on the plug to get into the chamber?

I wish I had blown it, believe me, I do...

1. timing
2. valve cover spark o rings
3. torqued in the wrong sequence headbolts and/or not torqued enough.
4. check for hydrocarbons

you may have to get in there once again.

___________________________________________



http://www.2gnt.com/quote_db.php?id=278

Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac
Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim

Haven't had much time to work on this lately but I did go ahead and do a bit of looking.
The head-valve cover spark plug seal isn't leaking. It's got to be a bad valve guide or stem seal. I'd be hard pressed to believe it's a ring that's failed in only 1,000 miles. I'll be doing a compression test when I get the time though, just to be safe.

Wait... is the oil on the plug and wire outside the combustion chamber? or is it building up on the electrodes inside the combustion chamber?

if you've got oil on the topside of the plug it has to be coming from the valve cover O-ring. the loss of power is because the spark is arcing through the oil to the head instead of going through the plug into the combustion chamber.

if the oil is inside then you've probably got rings that aren't clocked or gapped properly

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

Excuse me for my lack of description.
It's building up on the electrode inside the combustion chamber.

And the compression test today revealed: 215:210:140:210
Wet test for cylinder #3 gave back 185.

Looks like that cylinder's rings have failed somehow in the past 1500 miles since the rebuild.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

The reason you are lean on the remaining cylinder is becuase cylinder 3 is pumping out raw fuel. The o2 is picking that up and the ECU is trying to lean out abnd correct the mixture.