Dow.tom

iTrader: (3)

Well the car is back from the headgasket problem.... but now i have another problem. The car sounds like it's running on 3 cylnders. It's slightly louder and more robust noise. I thought it was lifters but after oil change same problem. It gets louder with acceleration. but when cruising it is hardly noticeable. Any suggestions before it goes back to the shop?

RacingGreen

missaligned timing belt?

samnavy

iTrader: (7)

Check that your spark plug wires are on the right plug.
Verify there are no vaccum leaks.

Braineack

iTrader: (62)

I'd say: vacuum leak, cam timing, or they furbared the headgasket

Dow.tom

iTrader: (3)

it happened just randomly, it ran fine, than out of no where...

patsmx5

iTrader: (16)

Get a timming light and crank the engine up. put the sensor on each sparkplug wire and make sure each cylinder is getting a spark consistantly. Change the sparkplugs, as one could have cracked or failed, and they're relatively cheap. While they're out, inspect them closely. Reading the plugs will tell you which cylinder is missing and if it's covered in gas, it's probably not getting spark or has very little compression. If your not gettting consistant spark to each cylinder, check the sparkplug wires for proper resistance using an ohm meter.

If all that checks out good, run a compression check. This will help you determine if there is a mechanical problem and which cylinders it's effecting. If this checks out ok, you've likely got a fuel problem. Again, reading the plugs will help you determine if the problem is just one cylinder or if it's all 4.

Dow.tom

iTrader: (3)

well the plugs were gunky on the threads and gray on the electrodes. dont know what that means. Not wet like it's spitting.

Savington

iTrader: (31)

Photos? Could be metal shavings.

Dow.tom

iTrader: (3)

okay... changed plugs. No good. Removed a spark plug wire at a time and put back on. Car suffered when off, returned to robust noise when back on. Put timing light on each plug and they were consistant. Finally i pulled my laptop up and used megasquirt to see my vacuume. 22 @ idle. I'm out of ideas, next?

socal pat

That would be mu guess. A friend of mine had the same symptoms on a fresh motor. We checked the oil for metal with a magnet, as well as all the checks the OP did. Turns out he left off the locator pin when aligning the gasket. It was off just enough to catch the edge of a piston and acted sort of like a playing card on the spokes of a bicycle wheel. Made a strange noise that almost made you whince.

Dow.tom

iTrader: (3)

yeah it sounds like a playing car on a bike! that's the sound. But could it come out of no where? I mean it wasn't like this when i got it from the shop. Now a hose did pop off and the car overheated to 2/3rds but it didnt make that noise immediately afterwards. Nor did it after i took it back to the shop. Should i take it back to the shop again? Could the gasket of moved and be hitting the piston? Also, i seem to still be losing oil, and i still have milky fluid on the rad cap, they said it's cause there was oil left in the hoses still.

thoughts?

patsmx5

iTrader: (16)

continue my list. compression check will tell you if it's a mechanical problem or a headgasket. Your shop says the oil in the coolant it from the oil left in the hoses. If there's water in the oil, it's the headgasket for sure. I would definately flush the cooling system soon so you can get the oil out and monitor it. If your loosing oil, you need to find out where it's going. Is it burning it or leaking it?

magnamx-5

iTrader: (7)

Tom if there is something fubard with it and they did the HG not to long ago make them fix it obviusly something is outof wack cause i highley doubt anything you have done has screwed the motor up like that. I would not pay a dime to get the sucker right. Worst case scenario you might hae a misalinged HG best case maybe a failing harmonic balancer mine made abit of noise under accel before it fell off. Check the bolts down there and make sure you haven't been fishing around. if they overtorqued the bolts or maybe just used shitty bolts they could fail.

Braineack

iTrader: (62)

remember, i changed my headgasket and it failed within 25 miles.

rough idle, overheating, 3-cly type running are clear signs of a messed up headgasket.

socal pat

I like Pat's list, but would substitute leakdown for compression test. It will tell you everything a comp test will and then some.

Dow.tom

iTrader: (3)

i dont have anything for a compression test, can i use a leakdown tester and crank and use it as a compression test?

Dow.tom

iTrader: (3)

i think it's burning oil honestly, i dont see any on the ground ever.

Braineack

iTrader: (62)

i think they screwed up your headgasket install. id take it back to the shop.

leakdown test would tell you right away.

if you put 100psi of air into each cylinder you can record how much loss is in each.

say you put 100psi in #4 and you only get a reading of 80psi. you know that you are losing 20% of your compression.

then you can listen for the air where it's exiting. if the radiator, its going into the coolant passages, so bad headgasket. if oil filler cap it could be the rings or headgasket throught the oil passages. if intake, the intake valves. if exhaust, the exhaust valves.

LOLA - 92

Exhaust Manifold Gasket leak?

Dow.tom

iTrader: (3)

could be that, but do these things arise from no where?