ss_slowmaro

Cylinder #1 problem, ok im dumb founded on this. i did a compression check and it came out to 40 psi. the spark plug isnt oil soaked at all and the car doesnt miss at WOT or regular driving throttle. I have painted LT's and all are starting to burn the paint and flake except the #1 cylinder that is only showing minor fading and flaking. It also doesnt burn any oil or smoke. any ideas on this?

muayyadf1

head gasket may be?

texas twister

rings,or valves,,might be hole in piston,head gasket

ss_slowmaro

Nah its not a head gasket, the oil isnt milky and doesnt burn any coolant or over heat.my guess in taking rings out of the question is crank splash fouling out plug due to bad ring.that is my guess but im no expert so correct me if im wrong. id be ok if it was a valve, thats better than a ring in my book.

99RTA

iTrader: (-1)

Do a leak down test and you will know.

ss_slowmaro

Next thing on the list of hunting down the problem

Also when i did the LT install the exhuast port looked normal with no build up of gunk or oil.
I daily drive it and after 25-30 minutes of driving operating oil pressure at aboout 1,800 rpms is about 43 and idle about 38. on a cold start the pressure is about 50-51.

IWGF

iTrader: (6)

Could still be a head gasket... I saw that same thing happen when I was working on a blown foxbody, it had no compression on one of the cylinders, pulled the head expecting a trashed motor, it was just a head gasket. None of the usual indicators for a head gasket. It's worth a shot man.

ss_slowmaro

I much rather pull the head than the motor, so if it is just a head gasket i would be content. pulling the head > dropping the motor.....again......

Thanks for all the input

IWGF

iTrader: (6)

Yeah man, I feel ya, pull the head and see what's what.

ss_slowmaro

Yeah, im hoping that its not anything to do with the piston. plus there are no signs of bad rings has good oil pressure, doesn't burn or consume oil or smoke, the exhaust port looks normal and the spark plug isnt oil soaked. then again i could just be in denial. so ill just pray and hope its just the headgasket.

DaddySS

Usually that type of symptom is top end not bottom end - like burnt or bent valve. When you say it doesn't miss at part or full throttle is that based on feel?

Like stated above, I would do a leak down test and see where it points you.

stevied916

iTrader: (30)

try putting the cylinder at tdc and hook the compression test tube to an air compressor as if you were changing the valve springs. See if you can hear the air leaking from anywhere. Compare it to the cylinder next to it

eallanboggs

iTrader: (1)

Do you have a misfire DTC at #1? Unlike Ford GMs misfire strategy is actually pretty useful. With compression that low you should be getting misfires on #1. Put a section of rubber hose over the dipstick tube and listen for air escaping during the leakdown.

ss_slowmaro

Yeah, i feel nothing in foward movement of the car or in the shifter. i can floor it at 1,000 rpms in 3rd gear and have no problems.

One thing i forgot to mention is that it does have a slight miss at idle

Like i said above i would rather pull a head than the motor, dont have the resources i once had to do that again. therefore id be paying someone to do something that i can......

Thanks for all the advice given to those who posted.

ss_slowmaro

Ill try and post up picks of the color change in LT's if that helps. and i video of the idle at cold and warm.

eallanboggs

iTrader: (1)

If you have the knowledge and ability to do the job you can probably buy the tools you need to complete the job for less than what you will pay someone else to do it for you. Some tools can be rented for free and you can borrow others tools. Some you may have to buy out right.

ss_slowmaro

That is my LAST resort, if it turns out to be a top end ill consider myself lucky.

Thanks to all for all the advice and insights

When i figure out the problem ill post up the info and possible pics

Thread/closed