Low compression in one cylinder
#11
You need to run a cylinder differential leak down test to find out what the issue is. If the cylinder has low compression it could be bad rings, piston, block, a valve, head, head gasket. A leak down test will pinpoint it. If the compression and leak down test passed then you need to look into an injector issue.
#12
2003 Neon, no compression on cylinder 1, & sounds like an intake leak
Compression is good on all cylinders but cylinder 1 has 0. There's a sound coming from I think the intake that sounds like an exhaust leak but coming from the intake side. Scan keeps showing a code for the MAP sensor but I replaces it and reset the codes but it's back. What could be the problem here?