Last year my father was driving the 4th gen. As it had a misfire at idle but never missed at 2000+ rpm.

I did the basic, replaced sparked plugs. Swapped coilpacks around to see if the miss would jump cylinders and it didn't. Swapped injectors around and nothing changed. I think it was always a miss on cylinder 5 or 6.

I completely forgot about that till now and i asked him what happened. He paid someone to replace a "gasket." I drove it today and it was good no more misfires, but now it has me wondering what was replaced.

I popped open the hood and saw leaking valve covers so i know it wasn't that. Everything else looks to be untouched.


So the million question is, what gasket could of been replaced to cure a misfire on a single cylinder only at idle.

 

I would guess, the intake manifold.

 

my guess would be the boot gaskets inside valve cover

 

spark plug gaskets?

 

This was my first guess but i looked at some of the valve cover bolts and they seem untouched. In order to get to the spark plug boots you have to replace the valve cover and should replace it while your there. The covers are leaking insanely in the front so i know it wasn't replaced.

The upper or lower intake manifold gasket does seem like a spot. Sadly my father doesn't have the powerwork. He does remember it was a gasket. No idea on cost or what.

 

TB gasket?

 

he replaced your rotating coupler valve gasket inside the engine



lower intake manifold gasket 100% sure

 

last week i changed the oil and flushed my radiator and also changed my therm. on my 96se bad this is that about after a few mins all the coolant cam out of my resignator ( braided piece on my exhaust) so now i was woundering if i change my head gaskets what other gaskets should i change??

 

In order to get to the spark plug boots you have to replace the valve cover and should replace it while your there.......




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I recently replaced my valve cover gaskets (both right and left bank), grommets, plug seals and also replaced the upper gasket on the intake phlenum. After putting everything back together the car turns but doesnt fire. My first guess was the coil packs but I just wanted to get an opinion before I go and spend more money. Would a failing EGR gasket (the one that connects to the intake manifold) cause the engine not to fire?

 

Bump.

 

i talked to my new neighbors today and com to find he a mechanic he took a look at my car and told me that it not a cracked head so that go my hopes up then he let me know that i could have a temp fix with liquid glass to fill the cracks if thats the case i might take it easy and start getting everything i need for a vq35 swap