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3/7/13, 7:41 AM |
#1
Motor help
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Member
Join Date: Jun 2008 Posts: 60 |
Hi I am chasing some help and thoughts on a current motor issue.
Currently running a mopar engine. When motor is above 3000rpm the motor start popping and stumbles for power. Battery voltage is 12.8 volts Currently we have tried the following with no resolution Changed the battery Changed the ignition leads We identified some issues with the wiring harness so we replaced this also. We are considering changing the crank triggers which is not an issue but would appreciate if others may provide feedback if you have experienced similar issue. Issue sound electrical but we are not so sure now and weighing thoughts around a fuel issue. Appreciate any thoughts you wish to share. Regards Phil Posted via Mobile Device |
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3/7/13, 7:49 AM | #2 | |
Senior Member
Join Date: Sep 2010 Posts: 954 |
Had a similar issue last year and it ended up being a intermittently failing fuel pressure regulator.
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3/7/13, 1:44 PM | #3 | |
Senior Member
Join Date: Aug 2008 Posts: 957 |
You might swap the coil out as well if you have a spare one around. Do you have a fuel pressure gauge so you can verify it stays consistent.
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3/7/13, 3:08 PM |
#4
Re: Motor help
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Senior Member
Join Date: Jul 2007 Posts: 1,324 |
You might also try checking your barrel valve and making sure it's set properly,I had the linkage arm slip one time thus throwing the settings off and making the motor pop and stumble when giving it throttle.
__________________
Terry James Jr.
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3/7/13, 10:52 PM |
#5
Re: Motor help
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Senior Member
Join Date: Jan 2008 Posts: 980 |
Is this a MoPAR Midget Motor? If so, is it a Sesco Style with MSD or does it have a Standard Block?
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3/7/13, 11:21 PM | #6 | |
Member
Join Date: Sep 2012 Posts: 6 |
More information on your motor.what are you running for injection
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3/8/13, 7:45 AM | #7 | |
Member
Join Date: Jun 2008 Posts: 60 |
Motor is a midget motor
MSD ignition Standard mopar block. Thanks for your feed back so far. Really appreciated. Posted via Mobile Device |
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3/8/13, 9:17 AM | #8 | |
Member
Join Date: Sep 2007 Posts: 7 |
Clear out any spikes in the box. Also, ditch the spark plugs and throw in a new set.
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3/8/13, 10:52 AM | #9 | |
Member
Join Date: Jul 2007 Posts: 190 |
Phil if you have had a battery fall below 10.8 volts while the engine is running you will almost certainly see that the ignition curve has gone haywire. It will now look like a heart rate monitor.
You can check you sensors with an ohm meter. Disconnect one and put a ohm meter lead on each pin. You should have between 100-130 ohms. While you are checking them wriggle the wires around as well to see If that effects it. Then do the same for the other sensor. Also check the sensor tip has not been damage by a rock or anything. Gap between the sensor and the wheel should be .060"-.080". If you have any questions or are unsure of anything let me know I will give you my number and go through it with you. Posted via Mobile Device |
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3/9/13, 10:59 AM | #10 | |
Member
Join Date: Jun 2008 Posts: 60 |
Not sure if we have solved the issue yet. Started going through the fuel system today and found the S valve jammed up and not opening properly. Engine start tomorrow.
Thanks for help so far. Has been a huge help. Thanks Posted via Mobile Device |
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