Pulled the truck into the garage to replace some lights. When I tried to start it the WTS light was flashing and the truck would only crank and not fire. I tried pulling codes and got nothing. I disconnected the batteries for a few minutes and nothing changed. I unplugged the Quadzilla and the WTS light functioned as normal. The truck started right up but instantly idled at 1200rpm and then went into 3cyl idle mode. I checked my idle control switch and it’s in the off position. My throttle is also unresponsive(Timbo). Thanks to my low stall converter I was able to get the truck out of the garage and back into its parking spot. When I parked it the idle dropped to 900rpm and still no response from pedal. I assume I need to do an apps reset due to disconnecting the batteries. Could the quad really be the cause of all this? I plan on doing the reset tomorrow and completely unplug the quad just to see if it runs stock.

Don't have any answers, just waiting to see what the APPS reset offers.

It will be interesting to see if the Quadzilla is the culprit.

• John

I went out and completely disconnected the Quad, and did the apps reset. Truck is back to flashing WTS light even with no Quad and still does the crank no fire. I feel as though I’m looking at an ECM rebuild? I did check the little bit of live data I get with my scanner and it showed TPS at 93% while not running obviously.

Edited June 1Jun 1 by Sycostang67

I have not experienced your situation, but from what I have read from related past postings on this site, you are in need of a rebuilt ECM. The ECM basically will not boot up, or won't finish booting up, so no engine start.

• John

Edited June 1Jun 1 by Tractorman

The ECM is the computer bolted to the driver side of the block, correct?

YES, go to the Vendor Directory here on the site and find Auto Computer Specialist. They have a good reputation with good results.

Ok, I found the ACS website and should get the ecm pulled today and hopefully in the mail tomorrow.

Pulled the computer and realized I forgot to get the mileage from the dash. Would it be safe to hook the batteries back up and to get the mileage without the computer installed?

Yes. The cluster will work without the PCM or ECM.

Still sitting on my thumbs with the truck. Not totally impressed with ACS, they’ve had my ecm at a work station for 2 weeks with no updates. I finally shot them an email today and was told it should ship out today. I’m going to assume that since I didn’t get an email with a tracking number that it wasn’t shipped. Even if it ships Monday, with the holiday next week I doubt I’ll see it for another week or two. Quadzilla has my tuner, or at least I assume they do. I shipped that to them a week and a half ago and haven’t heard anything from them. I sent them an email 2 days ago and haven’t gotten a response. My truck has been sitting for about a month now and I really have some stuff to do that I can’t do with a mustang.

Damn that sucks! Sorry to hear ACS is dragging their feet on customer service and a fair turnaround time to get you your ECM back to you.

Finally got my ECM back and installed and truck does the same thing as before. 😡. In all the google searches I’ve done, haven’t found any evidence of this issue ever being resolved.

Edited Monday at 07:22 PM5 days by Sycostang67

@Sycostang67 I'm sorry that you're stuck with your ECM not working.

I know you're upset, but calmly call ACS and find out what information you can about the repairs they have done and any other process or testing BEFORE the ECM is hooked up again. There is a solution, but we have to make sure the truck is ready and does not have another issue in the wiring or another device that will cause the same damage over again.

They sent me a lengthy email explaining everything they did and how all the issues I had were reflected in the condition of my ecm. I even undid everything I did the day it died before installing it just in case. Right now I need to borrow a truck to move some stuff around to make room for the ram in the backyard before my hoa notices it hasn’t moved in over 6 weeks.

3 minutes ago, Sycostang67 said:

They sent me a lengthy email explaining everything they did and how all the issues I had were reflected in the condition of my ecm.

Could you bring that over here so I can review what is going on? I'd love to help I need to know what they found to help you out.

4 minutes ago, Sycostang67 said:

Right now I need to borrow a truck to move some stuff around to make room for the ram in the backyard before my hoa notices it hasn’t moved in over 6 weeks.

Stupid HOA rules.

Here is the email.

SERVICE SUMMARY 📋 

What You Reported The ECU was received with the following issue(s): Upon turning ignition on, wait to start light flashes and the truck will only crank, but not fire up.  I also get no power to the fuel pump when bumping the key

What We Found After functional and bench testing, we confirmed the following issues:

• ECM Faults No Communication to Lift Pump, Shorted Circuits (Lift Pump & APP Circuit)’ Cold Solder Joints on CPU, No 5V Reference for Sensors, No 9.5V Reference for Lift Pump and Bad "Wait to Start" Light

These faults matched the reported concerns and DTCs provided. Further internal analysis confirmed abnormal behavior and internal component failure.

Repairs Performed The following work was completed:

ECM Repairs

• Replaced Lift Pump Circuit Restoring proper fuel pump communication. ⚡

• Resoldered CPU and Flash Chip Eliminating weak connections for stability. 🔧

• Resoldered 50 Pins Ensuring strong, reliable electrical connections. 🛠️

• Replaced APP Circuit (Shares Ground Circuit with: MAP Sensor, Accelerator Pedal Position Sensor, Camshaft Position Sensor, Water in Fuel Sensor, Engine Coolant Temp Sensor, Intake Air Temp Sensor, and Engine Oil Pressure Sensor) ⚠️ Any of these could have caused the short!)

• Replaced 5V Driver and Replaced 9.5V Driver Restoring functionality. ⚙️

• Replaced "Wait to Start" Light Circuit 🚦

• Updated Software Bringing ECM up to the latest specs. 🔄💻

Post-repair testing shows full communication and functional success. ✅ Your ECU is now ready for use — once root causes are resolved.

Were there any steps required for testing or repair on your side before the installation of the ECM for the first time?

It sounds like there was more internally wrong with the ECM, but I still wonder if there was something in the wiring of the truck that could have created this issue?

They listed a ton of possible causes for failure to check. Basically every sensor on the truck, damage to the harness, TSB’s, faulty grounds, etc. The truck ran perfectly and has for the last ten years when I pulled into the garage so I had no clue what to even look at. I did check some of the harness and found one tiny hole in a wire possibly from a probe, it wasn’t close to touching anything but I wrapped it up anyway. If I have time this weekend I plan to go through the whole thing and check all the grounds and fuses.

Just remember just one wire pinched in behind part, bolt, or bracket could do it. I had one where the PCM burned up because one wire was rubbing on the trans dipstick tube and fried the voltage regulator.

Edited Friday at 02:46 PM1 day by Mopar1973Man