340 engine not starting, out of ideas
#2875587
01/17/21 03:31 PM
01/17/21 03:31 PM
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Joined: Sep 2003
Posts: 1,267 Netherlands
72Challenger
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,267
Netherlands
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Hope one of you can help me out or at least gives ideas on what else to try & check. Must be overlooking something Had a Duster for years (totally redone 4000miles ago) and after having not ues it for long time its hard to start but lately stopped firing up at all. Its a 340 pumpgas, solid cammed, x-heads, edl intake, holley carb, msd etc backed up by a 727. It cranks but will not start and only every now and then gives it a try to fire up but nothing much. Checked and replaced so many stuff already but no luck. Not even with brake cleaner... Replaced or changed out (step by step) mopar distributor, msd blaster coil, battery, spark plugs, msd wires, fuel, etc Checked compression and all cylinders on average between 150-160psi Checked valve lash and all still fine. Checked spark at coil wire and gives 1” blueish solid spark. Get spark on the plugs as well. Gets fuel from carb or brake cleaner. Checked tdc vs balancer and is correct. Timing havent changed but turning it both sides did not make any difference. Got compression, fuel and spark but no luck. Supplied full 13v to msd 6al with extra batt but no change. Extra ground cables directly from engine to battery but no change. Battery fully charged. If in the end it starts its mostly after having it sit for 10mins so theres only like vapor in the intake. Still very hard but IF it fires up it runs fine as ever. Cranking the engine it sounds a bit like theres no compression but test says its fine. Feels like the spark is not lighting the fuel, and ir fuel not atomizing, lack of intake air speed or something. Im out of ideas so anything is appreciated? What and how to check more? Thanks a lot! Hans
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Re: 340 engine not starting, out of ideas
[Re: stumpy]
#2875614
01/17/21 04:15 PM
01/17/21 04:15 PM
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Joined: Sep 2003
Posts: 1,267 Netherlands
72Challenger
OP
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OP
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Joined: Sep 2003
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Netherlands
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Thanks!
Forgot to mention but the msd has power during crank & run as well as there is a spark during cranking.
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Re: 340 engine not starting, out of ideas
[Re: moparx]
#2875637
01/17/21 04:58 PM
01/17/21 04:58 PM
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Joined: Sep 2003
Posts: 1,267 Netherlands
72Challenger
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OP
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Joined: Sep 2003
Posts: 1,267
Netherlands
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Sometimes it makes an attempt to fire up but only a tiny one so sometimes it fires some cylinders but just not enough to get it running. Good tip about the distributor, will check that too
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Re: 340 engine not starting, out of ideas
[Re: 72Challenger]
#2875774
01/17/21 09:52 PM
01/17/21 09:52 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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I've had mixed luck with MSD. If it were mine, and I had a points distributor, I'd put it in and see what happens. 2¢
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: 340 engine not starting, out of ideas
[Re: NITROUSN]
#2875797
01/17/21 10:33 PM
01/17/21 10:33 PM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
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I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
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Have you actually had somebody look at the actual voltage while you are cranking it? Almost sounds like low/ marginal voltage. MSD acts weird with even a tiny bit low voltage. If you have a good battery charger hook it up and put in on boost and try starting the car
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 340 engine not starting, out of ideas
[Re: B3422W5]
#2875935
01/18/21 03:52 AM
01/18/21 03:52 AM
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Joined: Sep 2003
Posts: 1,267 Netherlands
72Challenger
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,267
Netherlands
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As for the battery it wont start fully chargerd, nor in boost mode on the charger and neither with kables to my truck so its not the battery I would say. As for fuel it's the correct one, fresh, but besides that, even with brake cleaner it does only gives an attempt by firing maybe one or two cyliinders, but no real start attempt. Will recheck the timing again. Was thinking about a leak down to double check / rule out other stuff but my compressor is not up to that task. Thinking as cranking makes it sound like there is no plug in it but again the dynamic compression ratio is plenty on all 8. Logically it should fire right up or at least try to...
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Re: 340 engine not starting, out of ideas
[Re: 72Challenger]
#2875981
01/18/21 11:09 AM
01/18/21 11:09 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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You drained/refilled the carb bowls with fresh gas? as mentioned retarded timing. Just thinking out loud on this but could you sub in another coil? for sure post what you find
live every 24 hour block of time like it's your last day on earth
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Re: 340 engine not starting, out of ideas
[Re: 72Challenger]
#2876028
01/18/21 12:50 PM
01/18/21 12:50 PM
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Joined: Jan 2003
Posts: 1,652 PA
70Duster
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,652
PA
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Put new spark plugs in it even if the old ones look fine. On more than one occasion, I've had gas fouled Champion plugs that would prevent the engine from starting even though they looked almost new. If you don't want to spring for new plugs, put the old ones in an oven at 450F for an hour, then install them into the engine as quickly as you can while they're still real hot, and fire it up.
Last edited by 70Duster; 01/18/21 12:51 PM.
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Re: 340 engine not starting, out of ideas
[Re: moparx]
#2876169
01/18/21 04:11 PM
01/18/21 04:11 PM
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Joined: Jan 2003
Posts: 10,931 North Dakota
6PakBee
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I Live Here
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Posts: 10,931
North Dakota
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So you successfully put 4000 miles on this car and after sitting, now this starting problem has surfaced. Is that a correct statement?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 340 engine not starting, out of ideas
[Re: Fat_Mike]
#2876187
01/18/21 04:40 PM
01/18/21 04:40 PM
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Joined: Nov 2007
Posts: 21,909 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,909
Kirkland, Washington
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Anyone remember a thread about a car that starts when you let OFF the key? As in, turn the key to "start" and it cranks, but won't start until the key is released and turns back to "run." I can't remember the cause (probably ignition), and can't find the thread. Thoughts on that??? That is either an ignition switch or more commonly it’s the bulkhead connector not making the connection on the start circuit to the coil.
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