FordSix Performance Forum

MechRick

In the early days of EFI development dyno operators would sometimes call my office to tell me "something is wrong with your EFI system - the engine is not running right." I had to talk them down off the ledge and explain that under all that electronics there was still a conventional engin...

MechRick

I had the original version (Carter AVS) on a 340 Duster. The bowl is very similar to the AFB, and I have had heat issues with those with a header. Tried the thick Ford 4bbl isolator, didn't help. A sheet metal heat shield between carb and intake might have done the trick, never got around to trying ...

MechRick

So I'm thinking that two 2-1/4 pipes, considering that I've only got 2.5 L per turbo at lower rpm and smaller turbos feeding them will work for the level of performance I want From experience, bigger down pipes will help the turbos spool quicker. Ford Turbo Coupes (Garrett T3 turbo and IHI RB52 in ...

MechRick

Does it happen after the engine is warm? I'm wondering if the valves are sticking in the guides when warm.

You might try a running compression test after the engine is good and warm.

MechRick

Nice work!

If you are running EFI you may run into problems with fuel slosh. Some sort of a baffle surrounding the pickup and fed by the return line would solve that.

I'm betting there is an o/e tank that could be made to work, perhaps the rear tank from F series or Bronco II?

MechRick

Air gets trapped in the master and slave from the angle of the drive line and master cyl mounting. Raise the back end of the truck until the valve cover is level, and rebleed. Remove the master from the firewall and depress the master plunger with a Phillips screwdriver, keeping the line fitting hig...

MechRick

How does that engine push your 3/4 ton around? Those are some great numbers.

MechRick

Yes, Nebr Rex. along with arse_sidewards and Backwoodswalker375, your sharp eyes noticed yellow top injectors rated at 19 lb/hr installed where gray tops are supposed to be (14 lbs/hr). https://fordsix.com/img/i.php?/upload/2019/04/20/20190420094516-596b75c4-sq.jpg Truck had a stuck open thermostat ...

MechRick

Follow the vacuum line off the EGR valve, it is supposed to be hooked to the solenoid I'm talking about...

MechRick

You will see 3 solenoids at the left rear of the valve cover above #5 and #6 spark plugs. Two of them are identical, those are TAB and TAD for the air injection. The remaining one will have a round plastic cap covering the vent tube with a foam filter inside to keep dirt out of the solenoid. The rou...

MechRick

332 egr valve opening not detected. The egr solenoid is on the rear left of the valve cover. Probably a vacuum issue. Best way to check, pop the round black plastic cover off, start the truck and block the tube on the solenoid with a finger. The egr valve should open and the truck will stumble if th...

MechRick

Ding! Ding! Ding! We have two winners so far... The coveted fordsix silver star goes to arse_sidewards and Backwoodswalker375 who both spotted the problem. Bonus points to arse_sidewards for noticing the missing purge valve. Since it's speed density, that will make it idle fast. I'll post an after p...

MechRick

To give others a chance, PM me or let it marinate for a while.

MechRick

Carbs used with blow-through setups will need to be incrementally richer. I recommend getting a good book on the subject (if you haven't already). I like Street Supercharging (S A design books, Pat Ganahl). It has a whole chapter on carb tuning for use with blowers. https://www.amazon.com/Complete-G...

MechRick

I was diagnosing an emissions failure on a 4.9L F150 today. It was blowing 1300 ppm HC and 13% CO. Thought I would share an image of the engine compartment. The owner has had a few different mechanics (using that term loosely) working on it. See if you can spot what was wrong with it. https://fordsi...

MechRick

Unplugging the FP relay will rule out a stuck injector or shorted injector control circuit.

You may have to pull and dry the plugs.

Determining whether it's spark or fuel will narrow the list of possible faults.

MechRick

With the compression you have, the engine should run given proper fuel and spark timing.
It sounds to me like you are getting too much fuel.

Would it be possible to unplug the fuel pump relay, dry the engine out and see if it runs with an external fuel source?

MechRick

The crank patterns are the same, but it might have a balance weight on it.
If so, knocking the weight off and neutral balancing it should do the trick.

MechRick

If one booster dribbles fuel before the other, double check the air bleeds for restrictions.

If the idle speed is set too high, fuel can dribble from the boosters, but both equally.

MechRick

Speed density or mass air flow? Make sure you have intake manifold vacuum to the MAP if the answer to that question is speed density.

MechRick

I wish you had a known good ECM so you could rule that out. I recommend going back to basics. When I get stumped on a strange electrical problem like this, I will walk away from it for a while to clear my head. It's amazing how the mind will get stuck in a diagnostic rut. Then I'll research the syst...

MechRick

One of those big two valve Kawasakis with an open megaphone header has to be the best sounding four in existence. Nothing like it...

MechRick

Sounds like an exhaust valve not opening. Might want to pull the valve cover, disable the ignition and crank the engine over while looking at the valve train...

MechRick

The EGR is to reduce NOX. It can also help fuel economy by reducing pumping losses. More throttle (to maintain speed when EGR is flowing) equals less manifold vacuum equals a reduction in pumping losses.

MechRick

Is it spitting air and fuel out of the carb while cranking, or just dumping liquid fuel like a stuck float valve?

Usually when an engine spits air and fuel out along with wrong distributor timing it indicates wrong cam timing.

MechRick

I like it!
Curious why you are running an external map sensor?

The common plenum on the tripower is cool. I was brainstorming one day about a one barrel throttle body in the middle with two carbs plumbed off the return line. Your solution is more practical.

MechRick

The spout circuit runs from pin 36 of the PCM to the 2nd pin in the ICM (pink wire). Disconnect the PCM and the ICM, key on, check for shorts to power and ground. Key off, check continuity between the PCM and ICM. You should read less than 2-3 ohms. It's a good idea to wiggle the harness during this...

MechRick

It depends on a bunch of factors, but 32 degrees sounds about right to me.

Are you still getting codes on a running test?

MechRick

'Spout' is the circuit from the PCM to the ignition module. When unplugging the spout connector with the engine running the code 213 will trip inadvertently. You shouldn't see it on a running test with the spout connector in place though. When Ford finally remote-mounted the TFI to the heat sink and...

MechRick

If you disconnect the spout connector while the engine is running, RPM should drop. Plugging it back in will have the opposite affect. Nothing moves in a TFI-IV distributor. You'll notice a short rod with a 90 degree bend where the vacuum advance would normally go (Ford calls it an octane rod, on en...

MechRick

I would try 12 BTDC and see how it runs. Listen carefully for ping. Are you running the stock speed density PCM? One of the advantages of Duraspark with a carb is the distributor can be recurved with springs and total advance can be limited by using a different advance plate, or restricting the tang...

MechRick

Isn't this like students lecturing the teacher? :D Opinions I have, limited experience I can share. I've always heard performance engines should be 'all in' at 3000 RPM. Tried this on a blow-through turbo on pump gas. Detonated like crazy. Conclusion? Pump gas engines with stock combustion chambers ...

MechRick

I've done something similar with a megasquirt while pulling a long, 6% grade. What I found is it's almost impossible to feel a seat of the pants difference when changing the timing tables. Advancing too much causes an audible ping, but no noticeable power change. I know the power output is changing,...

MechRick

Guys, I have to mention something you may find interesting or already know. So, about 4 days ago when the temp was about 12* warmer here, I measured in the afternoon the main bearings on my engine and they showed I had just under .0007. Four days later, when the temp is 12* colder, in the morning I...

MechRick

When I got the crank in the second block I found that the mains were out of spec. They were beyond the .0015 limit in the book My first 300 six went 285,000 miles before a carb bellcrank screw decided it wanted to be on top of #1 piston. This was an engine that rattled so bad on startup it would ma...

MechRick

I've run into this on Ford V8's. It's not uncommon to have to 'relieve' a cam bearing slightly. As long as it's limited to one edge of the bearing (and not the entire bearing) it should be fine. I had a 460 apart once that a remanufacturer had ground the cam bearing journals smaller (to save the cam...

MechRick

It may be possible to convert the hydraulics to use AN3 line. There are adapters to mate the 'o' ring/pin factory setup, something like Russell 640281 or similar. When I converted my Bronco and F150 to the ZF5, I had to use the tunnel cover off a later truck and a C6 trans mount to get it to fit und...

MechRick

Are you checking with a voltmeter? If so, just set it to DC volts, grab your two test leads and check the primary (coil) side for ~12v key on, and 0v key off. Primary side is the bottom right and middle wires in your image. Your red lead will tell you the polarity to determine which is ground (if it...

MechRick

From your image, it seems like the primary (coil) side of the relay has the correct signals. Try unplugging the relay and checking the red (orange?) wire for power, to rule out (or confirm) a short to VPWR.

Does the relay click when cycling the ign on/off?

MechRick

Sounds like a short in the VPWR circuit. VPWR comes from the ignition switch in 'run' and 'start'. It powers up (and turns on) the EEC relay, carb solenoid, TAB and TAD solenoids, throttle kicker (if equipped), tach (if equipped). The EEC relay will most likely have on the small pins (coil side), a ...

MechRick

I get a reading of 12.9 DC Volts at the battery with the alt charging at idle So I went out yesterday morning and tried the test again and it read 3-5 miliamps and it was jumping all around. After a few minutes it stabilized at around 1.0 milliamps and stayed there Immediately after I shut the truc...

MechRick

I'm running this setup on my Bronco with a Megasquirt: http://www.wide-band.com/product-p/apsx_d2n_gauge.htm https://shop.advanceautoparts.com/p/bosch-wide-band-oxygen-sensor-17014/18730616-p?c3ch=PLA&c3nid=18730616-P&adtype=pla_with_promotion&gclid=Cj0KCQiA3b3gBRDAARIsAL6D-N-uczHPcPaA3D...

MechRick

My recommendation would be to start with the jets, air bleeds and well tubes used on the Weber kit for 258 Jeeps. Barring that, some of the characteristics of the Weber (5200) are: Idle jet affects the transition circuits and idle. Idle is further adjustable by the screw. Trying to adjust idle with ...

MechRick

pmuller9 wrote:The Crower 284HDP (19205) .509”/.517” 220/222 284/290 110deg

Based on my experience with Comp's 268H (219 @ .050", 110 LC) that *might* lope a bit with a carb intake. Depends on idle RPM.

The lope went away with an EFI intake and aftermarket (Megasquirt) fuel management.

MechRick

If it spits fuel up out of the carb while cranking, it's most likely cam timing. To prove it, turn the balancer until the timing mark lines up at the 0 degree mark, pull the cap, the rotor should point at number 1 or number 6 (or slightly before). Since the distributor is driven by the cam, if cam t...

MechRick

The spacing between 4th and 5th on the ZF5 is a bit wide. When I'm towing my TT at a combined weight of ~12,000 lbs, I keep wishing for an extra gear between 4th and 5th or higher numerical rear gears. Higher gears would work fine, but limit top/cruise speed (probably not an issue with a bus). A ZF6...

MechRick

Years ago as a Ford dealer tech I had a Fox body come in for it's second warranty clutch at 8,700 miles. Yes, 8,700 miles. The disc was destroyed, all the clutch material down in the bellhousing. I asked the salesman that sold the car to the young girl to go for a ride with her and report back. His ...

MechRick

So that's the question right? Run the 390 pistons and not zero deck. Run the 1186 pistons and zero deck. I'm leaning towards 390 pistons with a close to zero deck. I run 93 octane anyway more for the additives than the octane. Assuming the same compression ratios is there an advantage either way? A...

MechRick

390 pistons will work, as long as the block is safe .050" over. 352 pistons will work, but will be proud of the deck a bit, milling the top of the pistons will fix that. There are no (to my knowledge) performance 352 pistons in the aftermarket. All of the above choices will result in an engine ...

MechRick

FYI, the stud mount carb heads used cast rockers, that clear the 'Power By Ford' valve cover. Other rockers may interfere with that particular cover. Clearancing the PCV baffles will allow it to fit.

I just thought you should know, and know you do.

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