• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Car Sputters Out

H

holanae

Well-Known Member
Local time
4:11 AM
Joined
May 11, 2015
Messages
83
Reaction score
4
Location
Houston
Cruizing it never happens, but if i get hard on it, and let off, the ignition drops out. Atleast i think its the ignition. During its stumble, its not responsive to the throttle. Take it to neutral and start it back up. It might run a little rough at first but continues on perfectly fine. It only happens once on my cruises around town. Get on it again and it does fine afterwards.
This started after a test and tune session on the dyno. It started burning up mopar ignition modules before i stepped up to a MSD ignition box. When it would stumble is when i would fry an ignition module. Luckily, the MSD box is alot more rugged and handle it. Car had no issues prior to the dyno visit. All wiring is new from full restoration 2 years ago. Running a fairly new Firecore distributor (Dec.) and new coil. Power and ground for the ignition module is hooked directly to the battery. Igntion on wire comes from the ignition run and start wires. Any ideas?

Wiring looks good. Pulled the dist. cap and everything looks good. Magnetic pickup is reading the correct ohms. Could it be alternator or voltage regulator related?
 
Last edited:
Were running a high flow mechanical pump. Its also brand new. Swapped it out on the dyno when the old pump was dropping down to 2 psi through the power band. Replaced the pump and pressure held steady at 6 or 7 psi. Cant remember exactly

Yesterday i goosed it. Not enough to spin the tires but more of playing around and it died. Get home, and stomped on it from a stop, let off after it gained traction and the car was running fine.
 
Float level? Debris in bottom of float bowl moving around?
 
Sight glass shows good levels. New carb installed before dyno run.

How about timing? Could that throw it off. Timing is set at 25 at idle, and all in at 2400rpms at 38.
 
Sea level. What’s the ambient temperature. Ethanol content of gas? Coolant temp when this happens.
 
It has happened at various temps. Running 93 pump gas .

Checked voltage at battery when running. Its at 15.3 volts at temp. Give gas then ket off and it went down to 14 volts. Gave it alot of gas and let off a few times. One time it dropped to 13vdc and the engine responded by running a little rough. Hit the gas and engine cleaned up and went back to 15 volts.
 
holanae said:
Sight glass shows good levels. New carb installed before dyno run.

How about timing? Could that throw it off. Timing is set at 25 at idle, and all in at 2400rpms at 38.
Click to expand...
New carb before the dyno and problems started on the dyno. I would start at the carb.
 
Sounds like it's too rich and fouling the plugs to me.
 
Just did a twenty plus mile cruise without issue. Got on it plenty of times. I originally was thinking ignition because i never found what was fouling out the oe ignition modules before i swapped to msd. Something so remote and unpredictable like this, now i am thinking stuck float. Like i said, car ran fine before dyno. Only thing he messed with was the distributor and the jetting.
 
You must log in or register to reply here.

Similar threads

jteck10
swapping distributors? HEI vs. non-HEI?
2
Replies
20
Views
1K
old guys rule
old guys rule
real0803
Electronic Ignition Replaced - Need help
Replies
6
Views
740
real0803
real0803
67Survivor!
Where do I grab power for the electric fuel pump?
Replies
19
Views
1K
BB BELLA
BB BELLA
sebring+
Throw the BOX!!?
2 3 4
Replies
72
Views
4K
old guys rule
old guys rule
1st Charger
'73 Charger acts like she wants to turn over, but will only intermittently
Replies
4
Views
366
padam
padam
Auto Transport Service
Back
Top