Question I have a 2003 dodge intrepid,3.5v6, the engine starts to turn over ( half a revolution ) and then it locks up. Thank you very much for your time
Answer Hi Richard,
That engine has a drive belt that connects the crankshaft to the cam shafts, and also the 4-valve per cylinder design means that the cam shafts have to rotate in synchrony with the pistons or there will be interference between the tops of the pistons and the valves. My belief is that the timing belt has broken and ideally this happened when you purposely turned it on and tried to start the engine rather than when it was moving at a high rpm because you might have avoided damage to the valves were that the case. There are three covers on the front of the engine which hide from view the timing belt and all the sprockets but the round cast metal cover on the left (driver side) upper corner of the engine may reveal whether the timing belt is indeed broken if you remove the bolts that hold it in place and gently pry the upper edge open a crack so you can look inside at the belt with the aid of a flash light. The other possibility is to look down the oil fill opening which may show the camshaft (I don't know this for sure) and then if that were so you could turn the crank by hand with a socket and a handle on the crank pulley center bolt and observe if the cam rotates in synchrony with your rotateion of the crank. That is a guess on my part.
But my thought is you have a broken timing belt and the engine only rotates so far until a piston strikes a valve.
Please 'rate' my answer (see below).
Knowledgeability = 10
Clarity of Response = 10
Politeness = 10
He backed up one of thoughts, i just did not want to hear that,lots of work ahead of me now. Roland pinned it down for me in a fairly quick time. Good work Rolland
Free fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.
I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question or asleep overnight so try again later.
I have do-it-yourself experience (50+ years) and a library of 100 1982-2011 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.
I was voted "Top expert" from 2010-2015 here at AllExperts, and have answered 20,000+ questions.
Five decades as a 'do-it-yourselfer' on domestic and imported cars
Organizations Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)
Education/Credentials Degrees in Physics/bruised knuckles.
Awards and Honors "Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts.
Quickest "average response time" at Allexperts (currently no. 1).