New 347 Build... '75 Street Queen

[Mountain Ram]

You're probably right, but do you remember what the open pressure is on your springs? I'm in the neighborhood of the mid 300s and I didn't get any valve float until about 5600rpm to give you an idea.

I will have to look to see what the pressure is. Unfortunately I have other issues to solve first...

I don't think it would effect your fuel/stalling issue, but did you break-in your cam properly?

It's a full roller cam and components. They were assembled with assembly lube and the engine was primed prior to start up.

When the truck starts- it runs and idles fine.

 

[Nightstick]

New 347 Build... WTF- no start again!

Okay, phew! I haven't taken the time to read your entire thread yet, but just saw you started with a 70s era block. Didn't get to where you converted to roller stuff yet.

Edit: I misread it. I saw 74 and thought that was the motor. Turns out that's the year of your rig, lol

 

[Mountain Ram]

Okay, phew! I haven't taken the time to read your entire thread yet, but just saw you started with a 70s era block. Didn't get to where you converted to roller stuff yet.

Edit: I misread it. I saw 74 and thought that was the motor. Turns out that's the year of your rig, lol

Actually started with a '75 truck with an '89 block, replaced by a '96 block... Just to add tithe confusion!!

 

[73azbronco]

Can we get a sound file of what it sounds like?

 

[Mountain Ram]

Can we get a sound file of what it sounds like?

When it tries to start or when actually running??

When it wont start, there is just the starter- no attempt to fire. I will see if I can get a sound byte on this if thats what you are referring to.

When running, at idle it sounds like it has a moderate cam- which it does. Throttle response is good. When it shits itself off- no sputtering, it just shuts off...

 

[SC74]

OK.... reading this has brought back horror memories of when I had similar problems. Mine would run great at times, and other times crank and stall before it would even warm.

My problem ended up being a fuel filter. It was new, but it wasn't allowing enough fuel volume. I know you have the same filter set-up as before, but maybe with the larger injectors etc you are maxed out on your fuel volume. When it idles, wrap your hand around the fuel supply line. It should have a steady vibration / flow to it. The way I found mine was that I felt a purge feeling in the line and knew I had a fuel issue. I bypassed my filters and it ran perfectly and I couldn't re-create the problem. Then I replaced both filters with high volume ones and haven't looked back.

I had my wife tow me back to the garage from the yard several times during this whole process - no fun!

 

[Mountain Ram]

OK.... reading this has brought back horror memories of when I had similar problems. Mine would run great at times, and other times crank and stall before it would even warm.

My problem ended up being a fuel filter. It was new, but it wasn't allowing enough fuel volume. I know you have the same filter set-up as before, but maybe with the larger injectors etc you are maxed out on your fuel volume. When it idles, wrap your hand around the fuel supply line. It should have a steady vibration / flow to it. The way I found mine was that I felt a purge feeling in the line and knew I had a fuel issue. I bypassed my filters and it ran perfectly and I couldn't re-create the problem. Then I replaced both filters with high volume ones and haven't looked back.

I had my wife tow me back to the garage from the yard several times during this whole process - no fun!

Do you have a part number for the filter you are using? I picked up a WIX high flow filter with 3/8 barb fittings, but I don't think it indicated EFI on it...

 

[chuzie]

The filter doesn't care if it is EFI unless it is being used on the high pressure side of the system; any filter will do just fine and 3/8 should be just fine. I have seen 1/4" filters out there that seem super small but I have run on in a pinch.

 

[Mountain Ram]

The filter doesn't care if it is EFI unless it is being used on the high pressure side of the system; any filter will do just fine and 3/8 should be just fine. I have seen 1/4" filters out there that seem super small but I have run on in a pinch.

Since the tank is old and has been thru God knows what- I put the filter between the tank and LP pump.

I have a new gauge and will see what we have once the babies go down

 

[Mountain Ram]

Well fuel is the problem... Just not in the pumps...

Pumps build 40psi with three turns of the key (run only). Pressure bleeds off about 10psi in 6 minutes. Truck would not fire on first two attempts... Fuel pressure stayed abou 40psi. Third attempt truck started and idled. Fuel pressure hung right at 34psi. Hit the gas pedal and pressure went up and response was good.

After less than two minutes- the truck shut off by itself. Fuel pressure gauge went up to 40psi. Attempt to restart- nothing.

Brought home a Noid light from work (we have a fleet and garage). With no start- I get nothing from the Noid light... I am going to pull the battery cable to see if I can kill the memory and start over.

I fear this means bad ECM... Your thoughts?

 

[Viperwolf1]

Could mean bad stator in distributor. Do you get spark at that time? If not I would suspect distributor.

 

[chuzie]

don't suppose you were able to observe fuel pressure behavior just prior to shutting off?

 

[Mountain Ram]

don't suppose you were able to observe fuel pressure behavior just prior to shutting off?

Fuel pressure was fine... Left the gauge hooked up. Definitely not firing the injectors...

Could mean bad stator in distributor. Do you get spark at that time? If not I would suspect distributor.

stator would be which part? Definitely no spark now. Likely when I had spark before it was going to fire but didn't.

This is a brand new dizzy from Summit... Summit brand with TFI. I have the old Dizzy that was in the '89 Merc Grand Marquis motor, but I don't think it was a roller motor... Still has the TFI. Could it be the TFI or is it the PIP inside the dizzy?

 

[Viperwolf1]

The PIP. If it isn't producing the PIP you won't get spark or injector firing. Try it with the SPOUT unplugged too.

 

[Bronco_69]

New 347 Build... WTF- no start again!

The 89 was a roller motor. As I said before that will most likely be the issue. Not the tfi, swap the whole distributor.

 

[Mountain Ram]

The PIP. If it isn't producing the PIP you won't get spark or injector firing. Try it with the SPOUT unplugged too.

Went thru the tests here Click Here to isolate the coil and work towards the PIP and TFi. Coil passed, got the the test for the PIP and I don't have an LED to test with.

Tried with the SPOUT unplugged and still won't start. How could this dizzy die so quick?? A few test starts and one day of riding around??

 

[Bronco_69]

New 347 Build... WTF- no start again!

The msd distributor is crap but if you bought the summit billet knock off distributor you should have just burned your money.

 

[Bronco_69]

New 347 Build... WTF- no start again!

You are hard headed!!

 

[Mountain Ram]

The msd distributor is crap but if you bought the summit billet knock off distributor you should have just burned your money.

Thanks for the productive comments...

You are hard headed!!

refer to my last comment...

I went thru the other items before I posted earlier and just wanted to state that I had run it back thru all points to the dizzy. I also had spark the other night which should have eliminated the dizzy... At least in my feeble mind.

As to the Summit Dizzy- there is a big Mustang following locally and Summit was recommended as many had the issues with the MSD.

I pulled the TFI off the old dizzy when cleaning it... I will pick up some thermal paste and reattach and see if it's good and where we go from there.

However this ends up- I appreciate everyone's help on here- if I wanted someone to point out my stupid mistakes or that I was hard headed... I would post this stuff on Pirate4x4 instead. That being said- I even appreciate your input Bronco_69...

 

[Bronco_69]

LOL. not trying to be a dick, but you could swap the dizzy out in ten minutes and be driving!!! I have been a corral.net member for 15 years or so and i dont ever remember anyone recommending the chinese distributors.

it could still be the ECM and kinda sounds like a burnt 46 pin. have you tried to pull codes? EFI is easy but you have to have some tools and listen to folks that have been there and done that.