I posted this in the '92-'96 forum....but just in case someone is lurking over here that can help.

Alright...stock motor was done and I had a 347 that I had just built to go in my '73 sitting in the shop, so I decided to drop it in my '95...but to use the '95's efi setup. I have made the swap and am having a problem that I can't seem to nail down.....let me go through the details of the build/swap and I need some expert opinions as I am running out of things to try/check.

'92 Roller Truck Block
Speed HYP Pistons Custom Machined Valve Reliefs
Hastings Rings
Comp 270HR Cam
GT40 Iron Heads Ported. Air Tubes blocked on back of heads.
FelPro PT2 Head Gaskets
Ford SVO 1.72 Roller Rockers
Ford M6513 - A50 Valve Springs
Manley Race Flo Valves Oversize
Ford EV6 Injectors 24# Blue Tops From Taurus but should be similar to M9593-AA302 Ford Motorsport Injectors
Eagle Stroker Crank
Eagle Rods
FelPro 1250 Intake Gaskets
Stock Dual Throttle Body
Stock 94MM MAF
Stock Bug2 (CBAZ0 Strategy) EECIV with Lasota Racing Chip (Programmed for 24# injectors, smog delete, and larger VE due to stroker)
Motorcraft Copper Plugs gapped .050 ('95 Cobra Mustang Plugs)
Ford Motorsport Racing 9mm Plug Wires
Stock TFI Distributor
MSD Blaster TFI Coil
MSD 6AL Ignition
Ford Motorsport Double Roller Timing Chain installed straight up.
Ford Lightning Shorty Headers to Custom Mandrel 2.5" Y-pipe to single inlet/dual outlet Magnaflow exhaust. No Cats, No smog pump.
Stock 02 Sensor (Not sure how old) remounted in driver side exhaust after y-pipe crosses back under oil pan. In other words connection is right side where the o2 lives and it is right before the right bank merges into the 2 to 1 collector.
Vacuum lines capped for Air Diverter tubes and smog pump.
New Water Pump
Stock Dual Tanks and Fuel Pumps - Reported these trucks have 125lph at 39.5 psi pumps

Also swapped in 2003 4r70w Tranny. Repinned wiring harness for solenoids, also changed in the '95 TCC solenoid which has the lower ohm rating to work with my EEC.

Problem is the truck starts great, idles steady, revs awesome. Problem is when I have a load on the vehicle. It will boil the tires for the first 20 feet and then starts to stumble to the point of basically stalling. I can floor and it will run, but with basically no power and sound like it's hitting on about 3 or 4 cylinders. I can put it back in neutral, rev up and it smoothes back out. Also check engine will flash on when this happens, and then off again. Here is the rundown of what I have checked thus far.

Only code other than the Code 511 which is caused by the custom chip.
KOEO Continuous Memory Code 181 - At richest adaptive limit/right bank lean.
KOER Test - 111 Passed
DTM Cylinder Balance Test - 90 Passed

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I am at wits end running so good (sounds like a world beater) and then dogs when load is applied.

Also I am guessing the 1250 gasket is ok to use with this head and manifold? From what I can tell it should be fine. Just trying to rule out a major vaccum leak.

Also what is the install torque for the lower manifold and the upper manifold?

Last thing would be a faulty or incorrectly programmed chip??

Help???
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check for vacuum leaks and double check the firing order

 

Can't find any vacuum leaks and firing order is correct. What do you guys show for installation torque for lower manifold and upper manifold?

I think it's a fuel delivery issue. FP should increase with throttle not decrease. I am cleaning and testing the injectors and when through I plan to first retest with fpr vacuum line unhooked, but plugged, as this raises fuel pressure to a 40 psi on my guage.
With vacuum line connected to fpr I am around 32-34 at idle and I have made it dip below 30 psi punching the throttle up in the 3,000 rpm area...which shouldn't be happening. If the 40psi trick seems to help, I am going to do the 2 pump trick to help with fuel flow, and probably install an adjustable fpr. If I drop below 40 on this test I think positively I have a fuel issue.

 

sounds like you need to get the truck to a dyno shop. you need to get the ecu tuned to run those 24lb injectors and the motor in general. you should always have 40psi also and when vacum line is pulled the pressure should rise considerably.

 

Thanks Kemicalburns....I plan to, but wanted to get it where it would at least run half way decent before taking over to the dyno for final tuning. I also had a chip burned for the 24# injectors and it is installed.

So you are saying FP should be at least 40 running and higher with fpr vacuum unhooked? I keep reading conflicting info on what's acceptable on fuel pressure. I think it's definitely a fuel issue and not the chip.

 

did this truck always have mass air or did you convert it over from speed density. the cam you have installed is no slouch thats also why it probably not running well. did the chip also compensate for the cam?

do a search on upgrading to a walpro 255 fuel pump. i know some bronco guys have had success doing this. and adjustable fpr would also help if the current pump was healthy

 

Came with MAF. Chip was burned to compensate for all changes.

 

Chip was the problem. Truck is running good on stock tune...even with the 24# injectors. Now at least I can take it to they dyno and start a new tune from there, but at least it's drivable!