start up questions

[Stace]

OK, a few q's

I relaced the head gasket (with a new one!) and put my engine back together, and ran it..

First, what I thought was a new leaking head gasket, I think is flooding fuel, and the car ran like crap. rolled the engine over without spark or fuel to clean the chambers and replaced a faulty plug, and it runs fin again...

Iget lots of white smoke out the exaust,..

Does this mean bad head gasket again?, or mabye I tightened it too much, I torqued it to about 50-lbs(haynes said 37, but I have a crappy torque wrench.)

or just burnin some condensation from sitting for 6 months.


q#2 I get smoke coming out my little valve cover breather..is that bad valve seals, and is it ok to run like that?

q#3 it back fires wierd when off throttle.. I think I'm running rich. 36# injectors at 25 psi fuel pressure.

would that back fire when I let go of the throttle?

[S.Bretz]

Wow sounds liek you need lots of help.

1) you tq the head bolts 25lb, then 35 or 37 lb, then do a 90 degree yeild,meaning you should turn the bolt 90 more degrees (1/4 of a turn). Once that is done, you should have about 60-65 ft/lbs on the head bolts.

Pull the cover off and torque them to 60 to be safe.

2)If you have smoke coming out of the breather, then that would lead me to think you have something wrong with the PCV system. That breather is suppose to pull fresh air, and the smoke is suppose to go into the intake so it can burn in the combustion chamber. That 'smoke' is a combination of oil vapors, and blow by on the rings. Also, if you used some cleaner, or got coolant into the oil system while working on the car, it can be some of that stuff evaporting out of the oil.

3) It should not back fire. If you have some way to tune the car, then it should not backfire. It sounds like you have 36lb injectors on a stock PCM, so it will back fire until you find a better way of doing things.

4) if you have smoke comeing out of the exhaust and you just did a head gasket, then I would suspect that you replaced the headgasket becasue the coolant was leaking into the cylinders, in that case, you can have and exhaust system full of coolant, and the it is being heated into steam and burning out. Plus, you might have oil in the cylinders or something, whicj will smoke too. See how it is after about a good hour of driving. Plus, seeing white steam out of the tail when its cold out is normal. When the hot gasses in the tail cool, they condense and pull in outside air. That air drown back into the system after it cools can contain moisture that will setting the ezxhaust, plus a by product of cumbustion is water, so the cooled down combusted gasses will condense and the water will fall into condensation that will later be heated and steamed out when you start the car.

[Stace]

ok, cool that sounds good, I was worried I over tightened the head bolts and squished the head gasket too much! I didnt want to rip this dang thing apart again!

I'm running the 36# injectors at 25 psi fuel pressure with an adjustable fuel pressure regulator and ajustable FMU
but Its flodding the engine out , I'm assuming thats why the odd backfire. So I'm slowly turning the pressure down to get it smoother running, I dont have the wide band hooked up yet. nor do I have the waste gate hocked up .

( I KNOW FMU"S are crappy, but I ran low boost and had good a/f ratios on the WB.... the engine had 300+km and spun a bearing)

[d3ad1ysp0rk]

OMG. Setup the WB and wastegate before you keep trying to get the car "running smoothly"!

Why do you keep doing a 1/2 ass job and hoping the engine will just take the abuse? [img]{SMILIES_PATH}/confused.gif[/img]

[tebriel]

^no shit. it could be you're just runnign super rich, which will make the car smoke as well.
-teb

[sl2fast]

( I KNOW FMU"S are crappy, but I ran low boost and had good a/f ratios on the WB.... the engine had 300+km and spun a bearing)

um spun rod bearing, isnt that a common symptom if you run too rich and ring wash then the gas that got by breaks down the viscous properties of the oil giving no lube what so ever pretty much acting as if you put water in instead of oil?

[Stace]

mabye, but the engine had over 300+kms on it.

and like I said, the WB was reading fine when I spun the bearing..the car was running fine... till I spun the tires at 8000+rpm around a corner.

I'm waiting to see if the head gasket holds before the WB02 goes in, I dont want to wreck it.. so I'm just trying to get the car driving right before boost.

Anyway, I cleaned the plugs and turned down the fuel pressure and it runs fine now, no acsesive smoke.

[d3ad1ysp0rk]

Ahhh,I thought the WG hole was blocked. Ok, yeah, that's fine I guess. Good luck.

[S.Bretz]

You reall shouldn't run less the 25-30 psi for fuel pressure.

I don't know how much boost or power you are making, but I started with 30lb injectors and made 235-240 across 3 dyno pulls.

[chrispel]

Yeah running fuel pressure that low screws with the atomization of it.

[Stace]

We tested the flow patern when we tested and cleaned these injectors and they were fine at 20 psi.

My mistake They were 32# injectors #5235236 olds injectors.

Surprizingly we tested crysler injectors (27# at 55psi) at 20 psi and they sprayed like pee.

Same with dsm blue tops.