Lopey Idle

[lil_dcb7]

My car is really loopy at idle (like its missing a cylinder)

I installed new plug wires and plugs(where i noticed i have a leak through my valve covers that i havent fixed yet)

my car will bog SOMETIMES. and sometimes, when i accelerate, it sounds like a WRX (lol best way i can describe it)

there is also a really weird smell i can sense. Although I think it might be burning coolant i spilled eariler.

my car also overheated yesterday(upon further inspection, my car was out of water((yes, i put water in a while back, i didnt have any coolant on hand, and i needed to go)

I'd appreciate any help! :cry:

 

[Finnon]

remove your plugs and check one of them hasnt been steam cleaned incase you have a bhg. also pressure test the cylinders.

perhaps where you have leaking cam covers you could have a lot of oil in the plug wells. This would cause a miss fire aswell

and keep a weekly check on fluid levels to avoid any low coolant issues

 

[lil_dcb7]

new update.

the car smokes. a lot. I have smoke coming from the exhaust, and from the down pipe in the engine bay.

at idle, if i rev it, there is a deep hesitation.

its a kinda white/gray smoke color. dosent smell like steam. kinda like an old truck lol

Im thinking its the valve cover gaskets. I recently removed the valve covers to repaint them. aaaand i didnt replace the VC gaskets.

so the reason its missing is its leaking oil into the cylinder holes(via leaky valve covers?)

I just need some one to confirm this before i take any action. I am broke, and most likely, I'd have to end up borrowing some of my parents money, and if it dosent fix the problem, they'd be very pissed.

 

[mpo]

Hi,

What year and how many miles? You put on the covers with no gasket of any kind???? Oh man that would leak a lot of oil. However that does not have any thing to do with coolant loss, loopy idle or smoke necessarily. You can pull the plug wires and look down in the wells and see if oil is pooled up around the plugs. I am not sure what the deal is though.

mpo

 

[lil_dcb7]

Hi,

What year and how many miles? You put on the covers with no gasket of any kind???? Oh man that would leak a lot of oil. However that does not have any thing to do with coolant loss, loopy idle or smoke necessarily. You can pull the plug wires and look down in the wells and see if oil is pooled up around the plugs. I am not sure what the deal is though.

mpo

i have an 87 supra with 180K

im actually pretty positive there are pools of oil around the spark plugs. lol

i put the valve covers back on with the original vc gaskets. which were about a year or so old...

so im thinking that this may be the issue.

 

[Finnon]

if you tightened the screws up too tight you could have crushed the gasket. also like i said above id be doing a compression test as what you say about the coolant would be a cause for concern

 

[lil_dcb7]

if you tightened the screws up too tight you could have crushed the gasket. also like i said above id be doing a compression test as what you say about the coolant would be a cause for concern

When I do the compression test, how much psi should i expect from the cylinders?

 

[cuel]

When you put the valve covers on, you need to use new gaskets, and put a dab of rtv in the front sharp corners where the covers go over the first caps. Get rid of the stock screws, and use bolts with a drop of locktite on the first couple threads. This will keep the bolts tight, and you'll be able to get them back out later.

For smoke from the tail pipe:
White is water/coolant
Blue is oil
Black is fuel

Good luck on your head gasket job.

Oh yeah, the cylinders should be within 20 lbs of each other, and none under 120.

http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=20

 

[chris717]

sounds like my car : )
i also have a problem, where could i get a cold start sensor?

 

[lil_dcb7]

When you put the valve covers on, you need to use new gaskets, and put a dab of rtv in the front sharp corners where the covers go over the first caps. Get rid of the stock screws, and use bolts with a drop of locktite on the first couple threads. This will keep the bolts tight, and you'll be able to get them back out later.

For smoke from the tail pipe:
White is water/coolant
Blue is oil
Black is fuel

Good luck on your head gasket job.

Oh yeah, the cylinders should be within 20 lbs of each other, and none under 120.

http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=20

dont jinx me man. so far, no signs of a bhg. just a loopy idle and smoke that smells like oil.

the color of the smoke is bluish/gray -shrug-

 

[cuel]

Earlier you said white/gray. Which is it? Not that it matters, you need to rebuild it either way.

If its blue, and smokes as you describe, then its piston rings, and you get to go even deeper into the motor. In that case, good luck with your rebuild.

There is no possible way for the valve covers to leak oil into the combustion chamber while the engine is running. On the motor, yes. Into it, no.

 

[lil_dcb7]

well bro, the head gasket is blown, and i am done with this motor! lol

 

[cuel]

Why? Its close to 20 yrs. old, and finally blew the head gasket? Besides, this isn't the cars fault. You said the rad. was completely empty when you finally got around to checking it. Did you bother to find out why? There must be a reason. I've done hundreds of head gasket jobs, on many different vehicles, even a Honda or 2. EVERY time, I've found a problem with the cooling system as the cause for the blown head gasket. How long has it been since you checked all your hoses? How often do you check/change your fluids(gasoline doesn't count)? Yeah, its the 20 year old cars fault, not the "steering wheel manipulator" that owns it...
Fixing a problem this involved would do you a lot of good. Maybe then you will actually inspect and maintain the vehicle so that it doesn't happen again.

 

[lil_dcb7]

Why? Its close to 20 yrs. old, and finally blew the head gasket? Besides, this isn't the cars fault. You said the rad. was completely empty when you finally got around to checking it. Did you bother to find out why? There must be a reason. I've done hundreds of head gasket jobs, on many different vehicles, even a Honda or 2. EVERY time, I've found a problem with the cooling system as the cause for the blown head gasket. How long has it been since you checked all your hoses? How often do you check/change your fluids(gasoline doesn't count)? Yeah, its the 20 year old cars fault, not the "steering wheel manipulator" that owns it...
Fixing a problem this involved would do you a lot of good. Maybe then you will actually inspect and maintain the vehicle so that it doesn't happen again.

dude dude, i know what you mean, please, dont be so quick to jump on my shit. when i say im done with this motor, i meant that since the car is going to be out of comission for a good while. i plan on getting a turbo motor. :nono:

 

[Finnon]

dude if you go down that route best of renewing the entire cooling system aswell ie new hoses all round and a new rad. also you might want to fit a new hg to the transplant motor to avoid future hg issues at the bare minimum

 

[lil_dcb7]

dude if you go down that route best of renewing the entire cooling system aswell ie new hoses all round and a new rad. also you might want to fit a new hg to the transplant motor to avoid future hg issues at the bare minimum

yeah thats what i planned on doing. all thats left is to do it.