1998 Chevy Camaro Missfire no.4

Tiny
JUVENTOSBOY
  • MEMBER
  • 1998 CHEVROLET CAMARO
Engine Mechanical problem
1998 Chevy Camaro 6 cyl Two Wheel Drive Automatic

I have a 1998 V6 3.8L Chevrolet Camaro Coupe. Last week while I was driving the car it was overheated then stopped. The car was inperfect condition before that! I got the radiator washed and the water pump changed and filled the radiator with red liquid and the heat is OK now! The problem is the Engine Missfire No.4 as per the GM computer check I made! The Mechanics here are saying they need to get the Engine out and fix the Engine Heads and the Gauges! How bad is that and what Spare Parts do I need for this problem?
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Saturday, October 18th, 2008 AT 3:29 AM

14 Replies

Tiny
RASMATAZ
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Misfire/P0304

A misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.
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Saturday, October 18th, 2008 AT 4:12 AM
Tiny
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I already replaced the spark plugs and the spark plugs wires and the fuel filter as well! When I start the car it starts immediatley but then it shakes a little more than before! When I put the transmission on D [Drive] and presses the brakes without moving the car it vibrates more.
The mechanics says I have to change the cylinder heads and retune the valves!
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Saturday, October 18th, 2008 AT 6:23 AM
Tiny
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Before you do anything -check the engine compression both dry and wet this will determine the engine condition. If compression is not within specifications the engine will not run properly no matter what parts you throw at it.

You have a misfire at cyl no.4 as you stated earlier check that cylinder's compression

What's wrong with the cylinder heads that they wanna work on it?-Something don't jive here-Is your vehicle overheating?
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Saturday, October 18th, 2008 AT 6:34 AM
Tiny
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Hi,

The GM Computer check read misfire No.4, not cylinder no. 4!

Any way, yeah that is what I was trying to say, I was driving the car and suddenly the heat indicator reached the red line and cheack gauge red light in the dashboard! The car was overheated for sure.

How do I check the compression in the cylinders? Is that runs by computer check or doeas the mechanic has to do something else?
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Saturday, October 18th, 2008 AT 7:10 AM
Tiny
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Sir -take it back to the mechanic and have him check cylinder no.4 compression then comeback and tell me the results

Here's more on misfires:

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Saturday, October 18th, 2008 AT 7:15 AM
Tiny
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OK, what should I expect him to tell me! I mean is the compression inside cylinder no.4 measurable will he give a number! What is the normal compression rate for a cylinder! Thanks man.
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Saturday, October 18th, 2008 AT 7:27 AM
Tiny
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He should know what to do to check engine compression with a compresion gauge or a cylinder leakage tester that's why you paying him for.

It seems that you don't trust this mechanic if so go somewhere else. I just hope he's not a partschanger or you'll be hurting big time-

When he does check it give me the readings and I'll you give the direction to take
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Saturday, October 18th, 2008 AT 7:34 AM
Tiny
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No he is ok but I need to know in advance what is the deal here! I will let him check it today and I I will tell you the readings tomorow.

I was worried because he immediatley said that we must take the Engine out and change cylinder heads because they were overheated (damaged) !

Thank you for your time
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Saturday, October 18th, 2008 AT 7:39 AM
Tiny
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I've asked you earlier is the engine overheating-if so could be a blown headgasket cracked head or block that he's trying to fix
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Saturday, October 18th, 2008 AT 7:42 AM
Tiny
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Yeah that is exactly what I was trying to ask you, could an overheated Engine can cause the cylinder heads to be damaged and must be replaced! And does this means that he must take the Engine out to do it?
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Saturday, October 18th, 2008 AT 7:46 AM
Tiny
RASMATAZ
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Yes an overheated engine can warped the head/s and if tolerance permit could be resurfaced if not must be replaced. Never done a 3.8 V6 engine is to removing the heads-Sorry
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Saturday, October 18th, 2008 AT 7:55 AM
Tiny
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So you agree with him that he must take the heads out to check its condition! What else can be changed if it is true that heades were damaged because of the Engine overheating?
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Saturday, October 18th, 2008 AT 7:58 AM
Tiny
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Most likely just the head gasket needs to be replaced-hope that this is the case
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Saturday, October 18th, 2008 AT 8:02 AM
Tiny
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Thank you very much man for your help I let you know tomorow. Thanks
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Saturday, October 18th, 2008 AT 8:19 AM

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