Out of my wits cause of this stupid problem. Getting a CEL, ran the codes and getting 71 and 73. Misfire in cylinders 1 and 3. Seems to be getting it during the day when it's hot and not during night time. I already changed my spark plugs and spark plug wires and no luck.

Anyway I can figure out what the problem is before I start spending big bucks to hope I can fix the problem?

Is there any relations between cylinder 1 and 3 that im missing? Any help is appriciated.

Read something in search about cleaning the EGR valve for this...I thought the EGR valve was only for emission purposes and didn't do much.

 

check your cap and rotor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h22a92accordex &raquo;</TD></TR><TR><TD CLASS="quote">check your cap and rotor</TD></TR></TABLE>
x2

 

1 & 3 are side by side in the firing order, 1342, it may be possible that timing is off BUT I would finish the tune up with cap and rotor. Because these two cylinders are not side by side on the engine, 1234, I do not think that you have a blown head gasket, has anyone adjusted the valves lately.

What happens when its warmer out, the coolant is actually warmer and the computer delivers a little less fuel based on ECT sensor readings, also air is thinner at warmer temps, both of these point to a lean air fuel ratio.

Pull the distributor cap and see if it has a bunch of brown dust in it, bearing particles gone corrosive and a wobbly shaft will cause a misfire on two cylinders next to each other in firing order like yours, check it out yo. This will require another dizzy, get it from the dealer, I think a sub assy, you can transfer your coil and ignitor.

EDIT
It could be EGR port problem, can you use a hand vacuum pump and apply vacuum to the EGR valve, the engine should die at idle, if it only starts to misfire then I would think that 2 of the EGR ports a clogged. 2 & 4 but they all will need to be cleaned if this looks like it could be the problem.


Modified by Duane_in_Japan at 1:54 AM 10/23/2006

 

Thanks for the reply Duane. Problem is that I ran a compression check and a leak down test. I have approximately 210 psi in cylinders 1,2,4 and cylinder 3 has compression 90. Did a leak down test and 1,2,4 have approximately 30% leak and the number 3 was so low i didn't even bother writing it down. I assume the timing belt skipped a tooth or something. One or more of the valves are bent. I'm going to remove the cylinder head and see whats going on. I read write ups and helm's manual and it does not seem difficult.

What Im wondering is if I should have a machine shop rebuilt the head with new valves or should I just buy a good condition used head. I am a college student and the budget is tight.

 

If you are going to pull the head yourself then just replace the valves bent too, its easy with some sort of valve spring compressor from autozone. A little valve grinding compound and a lapping tool, a drill would be fine with some TLC. Clean the compound off, reassemble head, put head back on car, adjust valves and start it up. Yes its a bit more involved but once you can pull and reinstall the head you have it beat for the rest.