ThrelkeldsZ

I just picked up a 98 z28. The previous owner said he bent a push rod so he replaced them. Well now the car back fires on start up and has coolant in the oil. Any ideas on what could cause this?

Zlow28

iTrader: (11)

a blown head gasket can cause that. But is there a lot of coolant in the oil? or is it just on the oil cap/lid.

Id run a compression test to check if you have power on all 8 cylinders.

ThrelkeldsZ

No it's mixed in the oil pretty good. And what would low pressure in a cylinder mean?

ThumpnZ28

iTrader: (23)

Head gasket(s). ^^^

Zlow28

iTrader: (11)

It means that there is en escape somewhere, and most of the time it happens to be the head gaskets. Does the car overheat when idling or feel sluggish when accelerating?

EDIt, if the coolant level seems to run low with no external leaks, and the oil has that brownish creamy color to it, you more than likely have a blown head gasket.

Zlow28

iTrader: (11)

now would be a good time for some 241s or 243s

ThrelkeldsZ

Yea the guy said it felt like it lost power when he drove it.

sopes

Head gasket or even a cracked head, did he overheat it ?

Zlow28

iTrader: (11)

there you have it. bad head gasket. Look into some 241 or 243 heads or at least an ls6 intake to make your work worth while. The labor will have to be done either way.

Rich-L79

If it's been driven much at all with coolant in the oil you likely also have ruined main, rod and cam bearings. Very possible the rings and cylinder walls have been damaged too. STOP DRIVING IT!

ThrelkeldsZ

Well the car is gonna be a DD for my 19 yr old sisters so it won't be modded just yet other the the lts and lid that's already on it

corvet786c

iTrader: (6)

gasket leak.

Bspeck82

Put 243s or 799s on it anyways because it's likely that it overheated and cracked the head as well. New gaskets, new heads and good to go. You should be able to find 799s on Ebay for 500 bucks or so.

If someone cant diagnose a head gasket faliure and continues to drive it around it will superheat and cause many more problems then just a bad gasket.

You will also need 99+ year valve covers with a bracket to mount coil packs onto it. Or find yourself some 98 heads. If your in Arizona I have a set in my garage.

G Atsma

6-1/2 year old thread revival....

Bspeck82

Oh good, Why does this keep happening? Becoming obnoxious.

Darth_V8r

iTrader: (4)

Check the user. Same guy brought back a few from the dead

G Atsma

MORE than a few....

LilJayV10

iTrader: (39)

My man on point!

**** I'm glad we have you.

G Atsma

Glad ya like it.. LOL This guy has been dragging up about a dozen old threads and replying with obvious one- or two-word answers.

LilJayV10

iTrader: (39)

Well I was actually being sarcastic....

It's something new the cool kids are doing.