Tex06

Would posting the fuel injection wiring diagram break any rules? Since I have them, I figure I can share. Sent from my SM-G930T using Tapatalk

Found (and halfway repaired! )the issue. By some dumb stroke of luck I found a '92 jeep factory service manual and bought it. I used the included wiring diagram to TS my issue. Broken solder on the MAP 5V supply wire. So basically my MAP sensor was pulling down my ECU through the output line,and that's why the truck would die. Ohmed everything out using the diagram, tore open the wiring harness, found the break (at the solder joint), repaired break and started rewrapping everything. Oh and tested...the truck starts so much easier now! It's the purple and white wire, where it goes into the black heat shrink was the issue. Power comes from pin 6 (also supplies 5V to the TPS, that's why the solder joint exists). Considering I had issues with my TPS getting low voltage before, I'm going to guess this was part of, if not most of the issue all along. Another shot of the purple and white wire. The MAP sensor connector is green and on the left Sent from my SM-G930T using Tapatalk

New wrinkle. The second new MAP acted exactly the same as the previous one. So I back probed all 3 wires, just in case I had the wrong signal wire and found this. As soon as I plug-in the MAP sensor, the supply voltage drops from 5V to 0.5V. My first thought is bad connector possibly? I'm looking to see if I have a spare to test. Sent from my SM-G930T using Tapatalk

Damn. Run it for 500 miles or so to let the clutch "set", we used to have to do that (or ride it a bit in the parking lot) after clutch jobs. A lot of times that and a good bleed would fix a lot of issues.

Ruh row. Same issue. Reading 0.3V with power on. Unplug MAP, reads 0V (no feedback in line). Gonna swap this for another MAP I guess. Sent from my SM-G930T using Tapatalk

Awesome. Let everyone know how it turns out (issues, works fine, etc.)

You putting it in the truck soon? Sent from my SM-G930T using Tapatalk

Control arm drop brackets? Sent from my SM-G930T using Tapatalk

Did you adjust the tps? The Renix motors have a small adjustment range that if you don't get right can cause issues. Sent from my SM-G930T using Tapatalk

I will give it a try. Thanks.Edit: Just to verify, you're saying yours started when you unplugged the MAP sensor? Yeah, although my setup is different being an OBD1. Started but ran real rough. If you have a multimeter and a paper clip you can check it properly. Sent from my SM-G930T using Tapatalk

Read through the whole thread and noone mentioned this but on my '92 I just had the MAP sensor fail. Caused a no start condition and I didn't have a CEL. Mine did run when I unplugged the MAP though (not great, and very rich). Possibly worth a try? http://troubleshootmyvehicle.com/jeep/4.0L/map-sensor-diagnostic-tests-1 Sent from my SM-G930T using Tapatalk

4.87VDC between MAP and negative terminal on battery. Getting a reading of .3 VDC on the signal side when the key is on. I disconnected the MAP and started the truck with my back probe in place. 0.3V. Connected the MAP and saw no change in value before it died. Repeated this but held the throttle mostly open and the motor kept running, still read .3V, died when I let off the throttle. I'm guessing it's reading too much vacuum? Either way I'm buying another sensor. This one is a Napa sensor less than a year old. Sent from my SM-G930T using Tapatalk

Will check when I get back. I know my TPS didn't like 4.8, when I cleaned up my ECU pins it came up to 4.94 and ran much better Sent from my SM-G930T using Tapatalk

Got a quick chance to test voltage....only seeing 4.81V at the connector. Not good....I'm gonna back probe this afternoon, if this is like my TPS issue then there's corrosion somewhere I need to find. Question: Is this 5 VDC the same as the 5VDC at the TPS? I'd like to check it in reference to the TPS ground (a known good signal ground) and see if I can eliminate the ground or the +5V side from my troubleshooting.

Too bad you're not a little closer. I'm looking to get rid of my '08 Mazdaspeed 3. Is hatchcar, Zoom-zoom! Sent from my SM-G930T using Tapatalk Is that Mazdaspeed 3 a turbo engine? Or was that a couple of years later? Heard those turbo engines were really hot and easy to goose up for even more Zoom-Zoom!Oh yeah. Turbocharged 2.3 L good for about 275/275 from the factory. Easy to hit 300hp with just a tune, start throwing parts on it and you can be in the 550+ hp range real quick. I've embarrassed many a new 5.0 'stang with my little hatch... Sent from my SM-G930T using Tapatalk

Yep next step is to back probe. Gonna have to wait until tomorrow, left the meter at work. For now I'm gonna run it with the MAP unplugged. Sent from my SM-G930T using Tapatalk

Sent from my SM-G930T using Tapatalk

Worked on Rambo last weekend, installed the headlight relay harness, replaced the valve cover gasket, vacuumed out the inside. Started up afterwards and got a CEL. Checked it today and got 12-14-13-55. 12 & 55 were expected. 13 &14 deal with the MAP sensor. Tried to start and it turns over and coughs but doesn't quite catch, even when holding the gas pedal (sorry, I'm still a carb guy with carb habits). Disconnected the MAP, hard to start but will, just doesn't like to idle (duh no MAP signal). Grabbed a spare MAP and swapped it in (high quality GM junkyard unit). Exact same issues. No start with, hard start disconnected. Already reset the codes by disconnecting battery and touching + to -. Tried it all again. No difference. Any ideas? I'm currently looking over my connections again... Sent from my SM-G930T using Tapatalk

Only way I can easily upload pics from my phone, otherwise I wouldn't use it. Sent from my SM-G930T using Tapatalk

Is this your way of saying you'd rather I'd not be on the forum at all Don? You know maybe I should have put $50 on Clemson :banana: Man some people are sore losers....... :peek:

I don't think that was the right link Don. Pulled up a nasty dispute between a member and some mods on deleting his post. I'm gonna try searching again... Sent from my SM-G930T using Tapatalk Huh, link works fine on the computer. Checked it again on my phone and it pulls up the same spat between a certain member and several Mods. Odd......

This is identical to mine: Sent from my SM-G930T using Tapatalk

I don't think that was the right link Don. Pulled up a nasty dispute between a member and some mods on deleting his post. I'm gonna try searching again... Sent from my SM-G930T using Tapatalk

What exactly is that? Sent from my SM-G930T using Tapatalk

Too bad you're not a little closer. I'm looking to get rid of my '08 Mazdaspeed 3. Is hatchcar, Zoom-zoom! Sent from my SM-G930T using Tapatalk