Lalasissyboy

P0301 - cylinder 1 misfire
Overheated to 5 bars at Jefferson's circuit wen the coolant hose between the intake and head blew. Replaced the hose then finished the last 20minute session then drove an hour home just fine. A few days later this code gets thrown and the car won't start. I'm thinking headgasket. Just looking for some ideas to throw around in case I missed anything. Gonna start small with the plugs and coil packs then work my way to a compression test and a leak test if I have to narrowing the problem. Again just looking for ideas to toss.

Lalasissyboy

Actually turns out my car is throwing 7 codes once I checked it myself. (can't trust any1 damnit)
Cylinder 1 misfire
Cylinder 2 misfire
Cylinder 3 misfire
Cylinder 4 misfire
Random misfire
Random / multiple misfire detection

And the other was because my modifications
Secondary air injection system which got thrown twice

MM3Kwolik

could very well be a bad valve adjustment/valves out of adjustment. I had a car come in the other day with all of those codes....after the valve adjustment, all was well.

TonysMI4

^ X2.

But I would still check the small stuff. If you have a misfire on cyl 1, it could mess with another cyl and make that one misfire. If that happen's the you will get the same codes.

Also do a leak down test... I overheated mine one time and got all the same codes. Ended up after it overheated 2 of the valves would not seat all the way making the car misfire and throw all the codes. cost $350 to have the head pulled apart and everything checked, 2 valves replaced and the head decked. I pulled the head and replaced it myself.

Lalasissyboy

Awesome great advice. I will deffinately check those tomorrow.

Lalasissyboy

Amazing! adjusted the valves and it runs great!

TonysMI4

Good to hear!