Resolved Cranks but still doesn’t start. Ran through the checklist and still doesn’t start.

reddy351 · Mar 12, 2024

This is another resource I’m using. All the way down to page 33 it starts getting into needing the breakout box.

http://www.rothfam.com/svo/reference/volumeH/1986/Section%2021%20DA-DG.pdf?fbclid=IwAR2tOKRZ1BmLZAsuB4Z_13pHaSUsjR-FJejp0_8REmDUh3SpExAPUIf6Zxg_aem_AaMEE17IiqH-dFpP-kM4UXvYuQduF_vxYeykpV6P6VfwCS-HX1gqdOld1K87mbbnPzc

Mustang5L5 · Mar 13, 2024

This one seems similar to how the Textrom 127 tests

reddy351 · Mar 13, 2024

I did this test today. All well above 10k ohms. I guess that rules out the harness.

reddy351 · Mar 13, 2024

On THIS test, it measures 10.0 ohms. The book tells me that if it’s over 5 ohms to repair “opens” in the circuit.

Be back soon…

reddy351 · Mar 13, 2024

Mustang5L5 said:
This one seems similar to how the Textrom 127 tests

I fixed the wiring and now both of the BP sensors read 2.69 and 2.66 V respectively. Seems to be a BP sensor, now.

reddy351 · Mar 13, 2024

Replaced the BP Sensor and NO MORE CODE 22.

But it will still barely idle. BP Sensor signal wire still reads 2.69v.

On to the next thing, I guess.

AeroCoupe · Mar 13, 2024

Base idle reset?

Mustang5L5 · Mar 14, 2024

Considering the car now has a BP signal to work off, i would start from scratch now.

Base idle reset, fuel pressure, timing, etc. Also wouldnt hurt to smoke test and verify no vac leaks. Get a few drives in and pull engine running and engine off codes and perhaps the cylinder balance test.

reddy351 · Mar 20, 2024

Well, it won’t idle enough to set base idle. FP is 38psi. Timing is set “straight-up with the #1 piston at TDC on the compression stroke and the rotor pointed directly at the contact for the #1 plug wire. That should at least get it close enough to start.

I have discovered the checklist thread for a 5.0 that cranks but won’t start. I guess I’ll start at the beginning, the next time I get a chance to work on it.

Here’s what I’ve checked/done so far:

Brand new Painless wiring harness
Fuel pump primes when KO
Fuel pressure-38psi KOEO
Fuel lines are connected correctly
Timing is correct
Firing order is correct
TPS measures .97v
Proper voltages at coil
Coil tests ok
Had a “22” code that I resolved
Replaced Baro Pressure sensor
Clutch pressure switch code (67)
EGR is deleted/blocked—those codes
Swapped A9L for “known good” unit
Swapped 30# injectors/aftermarket MAF for 19# injectors/stock MAF

If swapping drivelines was easy, everyone would be doing it.

AeroCoupe · Mar 20, 2024

Did you swap in 19 lb/hr injectors? MAF calibrated for 30 lb/hr injectors works good with 30 lb/hr injectors installed but a stock MAF calibrated for 19 lb/hr injectors with 30 lb/hr injectors installed will run like ass.

reddy351 · Mar 20, 2024

Nope. I swapped the 19# injectors AND the stock MAF that's made to work with them. I figure putting everything I can back to "stock" is a good baseline for the diagnostic process. (I should have never thought I could start with bigger injectors and aftermarket MAF to begin with.)

I can switch them back, once I get this figured out.

In this process, when trying to set the TPS, the voltage was extremely high when testing to Ground. When I probed the "Sig Return" (blk/wht wire) on the TPS, it was well within the proper voltage range and was very easy to set at .97v. That LOOKS like a grounding issue with the computer but the grounds for the EEC are connected to the location that the previous computer was grounded and I do have plenty of ground straps on the engine to body.

Can I connect the blk/wht wire to ground temporarily to see if that changes anything?

Mustang5L5 · Mar 20, 2024

TPS doesn't need to be 0.97V. That's just a myth. Acceptable range is 0.51V to 1.24V. Anything in there is perfectly fine. Upon startup that ECU takes a baseline idle reading and assigns that as a variable x indicating closed throttle. It then assigned a value to add to that number (I think it's 3.5V but not 100% sure) that indicates WOT.

Really you should be less focused on what the idle voltage is, and more focused on if the TPS voltage sweeps properly from idle to WOT. Nothing wrong with setting it to 1V, but don't lose sleep if it's 1.05V that's still good. Ford just slapped these sensors on and didn't calibrate anything. If they are out of range, they generate a code.

ANyway, code 67 is regarding not pressing the clutch in, or having the T5 in neutral. The painless kit may not have the provisions to connect to the clutch switch and the sensor on the top of the T5. If not, you may need to work-around this somewhat. It has a slight impact on idle quality, but don't think that is what is going on here.

BTW, you are running the codes with engine off AND with engine on correct? Have you done the cylinder balance test at the end of the code reading procedure?

reddy351 · Mar 20, 2024

Engine on? There IS no engine on. Thats the purpose of this post. It will not idle on its own. At all. I have to modulate the accelerator just to get it to stay running.

So, no, all of the codes I have are KOEO as that’s the only state that’s anywhere near reliable.

As far as setting the TPS, it was well out of the range you mentioned until I drilled out the mounting holes a little. After that, the best I achieved was 1.07v, using the negative battery post. When I used the “Sig Return” wire, I was able to get anywhere in the range that you mentioned. I simply set it where common knowledge says to set it. I just happened to set it at .97v.

reddy351 · Mar 20, 2024

The “67” code is the Neutral Start Switch. It actually has nothing to do with keeping the car from starting when the clutch isn’t engaged. It has more to do with the load on the engine when coasting down to a stop. Without it, the engine revs-up to keep the engine from stalling at low rpm’s. It also will not allow KOER tests as a safety to keep people from testing their automatic car in gear, since the KOER takes control of the engine rpm’s as part of the test. Don’t want Billy Bob’s Stanger to drive itself through the barn wall while running a diagnostic. Lol.

I really do appreciate your help in trying to get this running.

Mustang5L5 · Mar 20, 2024

Sorry, I was under the impression you were able to start the car, albeit with it running poorly. But we’ll enough to maybe pull the engine running codes

reddy351 · Mar 20, 2024

No sir. I’m still trying to attain that.

I pulled the codes on the replacement computer today. I get the same ones. So, apparently it’s not the computer.

AeroCoupe · Mar 21, 2024

I know it sounds tedious but can you provide the full list of KOEO codes?

reddy351 · Mar 21, 2024

Not tedious at all. I have them in my notes on my phone. Lol. This was done on a sub-50 degree day and the 21 and 24 are new (likely) because of that. The 31 is “new” because I unplugged the EGR eliminator that I had bought and put in there, to see if it made any difference. (It didn’t.)

21–ECT out of range
24–ACT out of range
31–EVP below min voltage
67–NPS failure
81–Air Diverter Solenoid fault
82–Air Diverter Solenoid fault
85–Canister Purge Solenoid failure
84–EGR vacuum circuit failure

reddy351 · Mar 25, 2024

Here it is, trying to start.

It does have a nice, bright spark that can easily be seen in direct sunlight.

The next step in the process is to spray some ether in it.

Edit: Will NOT start on ether.

Dropbox

www.dropbox.com

Edit 2: Compression:

1–115psi
2–117psi
3–117psi
4–122psi
5–119psi
6–127psi
7–120psi
8–108psi

reddy351 · Mar 25, 2024

I have a good one for you. After going through the “Cranks but no start” checklist, this is my result:

—Has nice bright spark that you can see in direct sunlight.
—Can hear the fuel pump priming for 2-4 seconds.
—When distributor is twisted in its hole, you can hear the fuel pump run again. (PIP is ok)
—Will not run with ether/starting fluid.
—Fuel pressure is 38psi.
—Noid light indicates injectors are getting their signal.
—Standalone harness. No s&p shakers.
—TPS set at .97v
—Firing order is correct.
—Distributor is stabbed correctly.
—Swapped computer with a known good one.
—Compression is as follows:
1–115psi
2–117psi
3–117psi
4–122psi
5–119psi
6–127psi
7–120psi
8–108psi

This is a fresh rebuild and has zero miles. Stock cam, AFR “Enforcer” heads, Cobra intake, 19# injectors and stock MAF. Using an A9L computer. It has a Walbro 255lph fuel pump that was fueling the turbo 2.3 six weeks ago.

What do I check next?

Resolved Cranks but still doesn’t start. Ran through the checklist and still doesn’t start.

reddy351

Mustang5L5

That is…until I whipped out my Bissell

reddy351

reddy351

reddy351

reddy351

AeroCoupe

lube between the nut and the face. I know my lubes

Mustang5L5

That is…until I whipped out my Bissell

reddy351

AeroCoupe

lube between the nut and the face. I know my lubes

reddy351

Mustang5L5

That is…until I whipped out my Bissell

reddy351

reddy351

Mustang5L5

That is…until I whipped out my Bissell

reddy351

AeroCoupe

lube between the nut and the face. I know my lubes

reddy351

reddy351

Dropbox

reddy351

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Resolved Cranks but still doesn’t start. Ran through the checklist and still doesn’t start.

That is…until I whipped out my Bissell

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

That is…until I whipped out my Bissell

lube between the nut and the face. I know my lubes

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