Good morning,
A question about an issue with my 1980 Pinto Runabout. 2.3 4 cylinder automatic.
When cruising at higher speeds, and occasionally at lower speeds I hear a misfire in the engine. The EGR line at the exhaust manifold runner popped off and could hear it coming from the number one cylinder, so the source has been tracked down as to the exact cylinder. I've fixed the line but my question is any suggestions as to what can be causing the misfire? On my project post pintosopher had indicated something about the EGR may have a cracked housing, or possibly a bad gasket at or below the EGR, such as the carb mounting plate, causing it to run poorly when cold.
My question is could this also cause my random misfire at number one? I currently have four Autolite platinum plugs in the engine which were installed about 2300 miles ago when the engine was installed from the 77. Cam timing has been checked, and on the money, as is ignition timing. New plug wires installed before driving to the Pinto vs Maverick show, and distributor cap and rotor also replaced when the motor was installed.
The car runs good, except for this misfire.
Now recently I did replace the followers and lifters since I thought I had a bad one due to a top end noise. Turns out the noise wasn't mechanical in nature but the EGR line from the manifold, but when I had the followers out I noticed the number one cylinder cam lobe had some rust pitting. I didn't have a replacement camshaft to put in, and don't recall if it was like that or not in 2007 when I installed it in the engine. Since the rest were perfect my guess is it was.
Any ideas are appreciated.
Thanks!