if any one could help i would greatly appreciate it i have a 97 with a 5.2 (318) when i drive it somewhere over 70mph or once at about 50 mph loaded fairly heavy the check engine light comes on when i took it to autozone the code came up cylinder 1 misfire i don't hear or feel a misfire at all i've heard a crankshaft position sensor might cause this but really can't afford to buy parts guessing the cause anyone have any ideas?

 

I moved your thread to the proper forum.

Welcome!

You may not hear/feel a misfire. Have you pulled the plug yet? What was the condition? How is the plug wire? Cap? Rotor? All of these can wear out and fail under heavy load.

Translation: start with the basics. If it was a bad crankshaft position sensor you'd probably have other issues.

 

thanks! i didn't realise i postedin the wrong forum . No i haven't changed the plugs , wires, cap or rotor yet planning on doing a complete tune up soon just concerned because it runs fine until i go over 70 or the one time i was going uphill loaded heavy about 50 then the check engine light comes on an i just thought this might be strange

 

At least pull plug #1 and check it out.

I wouldn't delay a repair with a misfire. It can damage the catalyst and that gets $$$.

 

sounds to me like the computer is rolling too much timing in under load, or you have insufficient octane fuel (hand in hand), or the cylinder pressure is exceeding what the head gasket or piston rings can retain, or anything in between. Could even be a failing fuel injector.