86 thunderbird 5.0 HO misfire in #2

Asked by Jul 17, 2014 at 12:38 AM about the Ford Mustang

Question type: Maintenance & Repair

i have a misfire in cylinder # 2 at idle and low rpm. i have replaced the spark plugs and
checked the gaps on them (.045), changed the injector and o-rings, wires, coil,
distributor cap and rotor, upper manifold gasket, throttle body and EGR gaskets,
checked and replaced almost all vacuum lines, purge valve and still having the
problem. the misfire is followed up by a ping in the exhaust and only does it at idle and
low rpms. if i remove the spark plug wire for cylinder #2 the ping in the exhaust goes
away and the car seems to be running smoothly like there was never a miss at all.
when i removed the EGR there seems to be coolant in it as well.

4 Answers

241,875

If coolant is in the EGR, the throttle body gasket to the EGR plate is compromised and needs to be replaced. Some people take the coolant lines that go to the spaces and plug them. So you are leaking coolant into your engine and burning it, and that might be giving you your misfire code.

241,875

FEL-PRO Part # 70261 Throttle body to EGR valve = $2

241,875

When you replaced the throttle body, I assume you replaced this gasket? If you did, then I'd suggest doing a leak down or compression check of all cylinders.

I timed it last night and it seemed to help alot then it started to act up again and now there is no power in any gear and it will spit and sputter and the car will drop really low in rpms and cut out

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