no1parfive Posted March 13, 2018 Share Posted March 13, 2018 Have 1989 TC, SOHC, 4-cyl. First start of the day is OK, After running to normal temp and I shut it off, engine will not re-start (turns over but not start). Wait a couple of hours, engine will start and run normally. Bottom line, engine will only start if cold. Any ideas as to the problem? Link to comment Share on other sites More sharing options...
Hemi Dude Posted March 14, 2018 Share Posted March 14, 2018 Guessing could lead you in the wrong direction and you may be buying parts you don't need, BUT if I were to take a wild guess, I would suggest the distributor pick-up plate. The good thing about trying this, if it still does not start, at least you have the replacement part for when the original one fails. And thy do. Link to comment Share on other sites More sharing options...
no1parfive Posted March 14, 2018 Author Share Posted March 14, 2018 Would this malfunction only when engine is hot? My engine starts OK when engine is cold. Link to comment Share on other sites More sharing options...
Hemi Dude Posted March 14, 2018 Share Posted March 14, 2018 3 hours ago, no1parfive said: Would this malfunction only when engine is hot? My engine starts OK when engine is cold. It only shows up when the engine heats up and the pick-up plate heats up to begin with, until it fails altogether. Remember, this is only a "best guess". If you get a new pick-up plate and install it, you will soon see. If the problem persists, you need to give us some trouble codes to go on. Diagnosing long distance requires at least some basic information from you. We are here to help, but guessing in not the way to go. Link to comment Share on other sites More sharing options...
TexasLowell Posted March 14, 2018 Share Posted March 14, 2018 I had a similar problem. The fuel line had a small hole in it. It as the short fuel line under the hood. Link to comment Share on other sites More sharing options...
no1parfive Posted March 15, 2018 Author Share Posted March 15, 2018 Did not find any holes in fuel lines, thanks for your input. Link to comment Share on other sites More sharing options...
TwinCamFan Posted March 17, 2018 Share Posted March 17, 2018 Does your tachometer register movement during the hot no start condition? It wont move much, the starter is only spinning the motor a couple hundred RPM's but it should move some. if no bumping of the needle at all its your HEP/DPU as Mr Anderson said. If it moves you need to move onto the next potential culprit like low fuel pressure etc. Link to comment Share on other sites More sharing options...
no1parfive Posted March 18, 2018 Author Share Posted March 18, 2018 Tac moves when cranking, I'm now thinking more of a fuel pressure problem or distributor pick-up. Link to comment Share on other sites More sharing options...
Hemi Dude Posted March 19, 2018 Share Posted March 19, 2018 4 hours ago, no1parfive said: Tac moves when cranking, I'm now thinking more of a fuel pressure problem or distributor pick-up. The tachometer would not be moving if it was the distributor pickup. Try testing the fuel pressure with a fuel pressure gauge & hose setup made to attach at the fuel rail test connection. Link to comment Share on other sites More sharing options...
no1parfive Posted March 20, 2018 Author Share Posted March 20, 2018 Question, would a fuel pressure problem only show itself when engine is hot? My engine starts ok when cool. Link to comment Share on other sites More sharing options...
retiredmechanic74 Posted March 20, 2018 Share Posted March 20, 2018 The pick up in the distributor ( the hall effect coil) sounds like the problem as an old Chrysler Dealership mechanic I've seen these as to be most of the problems with starting and performance. BUT I could be wrong But if it were me I would replace it anyway. Link to comment Share on other sites More sharing options...
no1parfive Posted March 20, 2018 Author Share Posted March 20, 2018 Ordered pick-up coil, will replace when received. Link to comment Share on other sites More sharing options...
Hemi Dude Posted March 21, 2018 Share Posted March 21, 2018 10 hours ago, no1parfive said: Ordered pick-up coil, will replace when received. I think I told you that in my first "GUESS" reply! Link to comment Share on other sites More sharing options...
TwinCamFan Posted March 21, 2018 Share Posted March 21, 2018 AND we've already established that the tach moves during cranking and no-start condition. It's not the HEP, gotta move on with diagnosis... Yes, fuel pressure can drop radically when the pump is weak and when *it* gets hot. Not really when the motor is hot, but the pump it'self can build heat. In fact a classic symptom of a failing fuel pump is *car stalled, but it started again after I let it cool down. Drove a few miles and it stalled again, restarted when cooled down*. You could throw a pump at it (if i'm using parts store pumps I like the Airtex pumps, they usually are quality and come with all the pieces. In fact, they will have the whole fuel level sensor and tank access door all attached and ready to drop in.) It's a lot less work than disassembling the whole assembly and replacing only the pump and hoses and pick up filter and... But A better DIAGNOSTIC test would be to put a fuel pressure gauge on the fuel rail schrader fitting and view it when the problem occurs but Im betting you don't have one of those so that means throw parts at it like you are the HEP switch. Link to comment Share on other sites More sharing options...
retiredmechanic74 Posted March 21, 2018 Share Posted March 21, 2018 It would be fair to mention that the fuel pump is kept cool by staying submerged in the gasoline if you run the gas down to a point of uncovering the pump then it will begin to get hot. This is one of the big reasons a pump goes bad. Made in China is another one. Link to comment Share on other sites More sharing options...
no1parfive Posted March 22, 2018 Author Share Posted March 22, 2018 Experienced same starting problems when tank was full. Link to comment Share on other sites More sharing options...
retiredmechanic74 Posted March 22, 2018 Share Posted March 22, 2018 1 hour ago, no1parfive said: Experienced same starting problems when tank was full. I'm convinced it's electrical ether the hall effect coil or the ign. coil. Link to comment Share on other sites More sharing options...
no1parfive Posted March 23, 2018 Author Share Posted March 23, 2018 (edited) Replaced hall effect coil, fuel pressure regulator, and ignition coil, problem still exists. Will replace fuel pump, hope that is the problem, if not, I'm back at square one. Edited March 23, 2018 by no1parfive (see edit history) Link to comment Share on other sites More sharing options...
retiredmechanic74 Posted March 23, 2018 Share Posted March 23, 2018 3 minutes ago, no1parfive said: Replaced hall effect coil and ignition coil, problem still exists. Will replace fuel pump, hope that is the problem, if not, I'm back at square one. I am very surprised, Please let us know what caused it. I don't want to make that mistake again. Link to comment Share on other sites More sharing options...
no1parfive Posted March 23, 2018 Author Share Posted March 23, 2018 Will do. Link to comment Share on other sites More sharing options...
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