youngfred Posted April 20, 2019 Share Posted April 20, 2019 ... Well got everything up-to-date and the truck is - Ready-to-Start. ___________________________________________________________________________________________________________ Check out my Build : ______________________________________________________________________________________________________________ Now : All Maintenance and Friction Items have been : Inspected Refurbished Repaired Replaced. This 1991 - 4.0 - has not been started since, (per Inspection Sticker) - 2011. I replaced the ICU with a refurbished from Houston. (The original appeared to be in bad shape with the mounting stud broken-off…) Had replaced the CPS with Rock Auto - ‘Standard’ brand. Complete Fuel System(fuel tank to injectors), has been gone-through. New Fuel Tank New Bosch Fuel Pump Rebuilt In-Tank Sending Unit New Fuel Filter Fuel Injectors Pro Cleaned Cleaned Fuel Rail New Pressure Regulator Fuel Pressure Gauge/Fuel Rail ~ Crank- -No-Start. -NO Fuel Pressure - on fuel rail gauge . KeyON- Remove Fuel Pump Relay- Jumper Pump- Hear Pump- Fuel-Rail Gauge shows building-pressure- -Fuel Pump is Working . Remove New CPS- Install the Old-Original One- Crank- -No Start . Next I am going to pull a spark plug And crank to see I I am getting - fire. This is as far as I have gotten. Without wasting time, what would be the next way to go. Any help would be appreciated. youngfred Link to comment Share on other sites More sharing options...
Dzimm Posted April 20, 2019 Share Posted April 20, 2019 Clean up the ground behind the drivers taillight. You've already narrowed it down to fuel and from the sounds of it, you aren't getting power to your pump. Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 11 minutes ago, Dzimm said: Clean up the ground behind the drivers taillight. You've already narrowed it down to fuel and from the sounds of it, you aren't getting power to your pump. ... Thanks, I will check that. I forgot to mention that the Dash Fuel Gauge does not move, with Key-ON. I will clean the Ground Point behind the taillight. youngfred Link to comment Share on other sites More sharing options...
Ωhm Posted April 20, 2019 Share Posted April 20, 2019 10 hours ago, youngfred said: KeyON- Remove Fuel Pump Relay- Jumper Pump- Hear Pump- Fuel-Rail Gauge shows building-pressure- -Fuel Pump is Working Did you jumper the fuel pump at the fuel pump relay block? Pin C216_1(30) to C216_4(87). Use a fused jumper. Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 8 minutes ago, Ωhm said: Did you jumper the fuel pump at the fuel pump relay block? Pin C216_1(30) to C216_4(87). ... Yes, I did. I also replaced the AutoShutdown Relay, on the Block. Still- No Start. youngfred Link to comment Share on other sites More sharing options...
Ωhm Posted April 20, 2019 Share Posted April 20, 2019 So when you jumped the fuel pump at the fuel pump relay block you got fuel pressure, but still had a NO START condition? Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 1 hour ago, Ωhm said: So when you jumped the fuel pump at the fuel pump relay block you got fuel pressure, but still had a NO START condition? ... Ahhh...(said the blind-man) I see, I see. I jumped the fuel pump, at the relay - only, to test the pump. So, should I fuse-jumper the pump that way and try to start? I wil try that after I check - Ground. youngfred Link to comment Share on other sites More sharing options...
Ωhm Posted April 20, 2019 Share Posted April 20, 2019 1 minute ago, youngfred said: So, should I fuse-jumper the pump that way and try to start? Yes Link to comment Share on other sites More sharing options...
Jeep Driver Posted April 20, 2019 Share Posted April 20, 2019 I'd suggest reinstalling the original ECU. And test your fusible links, all seven of those...........they belong in the trash but that's another matter. Link to comment Share on other sites More sharing options...
JMO413 Posted April 20, 2019 Share Posted April 20, 2019 Have you tested the CPS with a multimeter? Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 4 hours ago, Ωhm said: Yes ... KeyON-START- Fused Jumper at Fuel Pump Relay- Fuel Rail Gauge shows - 50- -No Fire - not even a cough. youngfred Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 1 hour ago, Jeep Driver said: I'd suggest reinstalling the original ECU. And test your fusible links, all seven of those...........they belong in the trash but that's another matter. ... Original ECU - GONE - Core Exchange. youngfred Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 1 hour ago, JMO413 said: Have you tested the CPS with a multimeter? ... No, I have not. I will do that, next. Thanks, youngfred Link to comment Share on other sites More sharing options...
Ωhm Posted April 20, 2019 Share Posted April 20, 2019 Two things: 1) 50psi seems high for fuel rail pressure, could be the gauge used. Pull and check plugs for wet fouling. 2) Since you don't get fuel rail pressure when the fuel pump relay is installed. Disconnect and check for voltage at the Ignition Control module (ICM) connector C213_A with the KEY ON and during CRANK. Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 1 hour ago, youngfred said: ... No, I have not. I will do that, next. Thanks, youngfred ... Static tested - Unplugged the CPS - Ohmmeter shows OPEN -between B and C. Plugged in the CPS and checked for Voltage at the three Pins With Key-ON and with Key-START. No Voltage readings. youngfred Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 18 minutes ago, Ωhm said: Two things: 1) 50psi seems high for fuel rail pressure, could be the gauge used. Pull and check plugs for wet fouling. 2) Since you don't get fuel rail pressure when the fuel pump relay is installed. Disconnect and check for voltage at the Ignition Control module (ICM) connector C213_A with the KEY ON and during CRANK. ... Went back and retested with: KeyON-START- Fused Jumper at Relay- JEGS- 0-60 psi fuel pressure gauge - This time, up to 55psi - Can smell fuel at fuel rail area - no leaks, though. No Fuel Fouling - on Plugs youngfred Link to comment Share on other sites More sharing options...
JMO413 Posted April 20, 2019 Share Posted April 20, 2019 CPS testing. Link to comment Share on other sites More sharing options...
JMO413 Posted April 20, 2019 Share Posted April 20, 2019 That was more than I was trying to quote sorry. Read Cruisers testing of the CPS towards the bottom. Link to comment Share on other sites More sharing options...
youngfred Posted April 20, 2019 Author Share Posted April 20, 2019 ... Disconnected the Neg Batt cable- Unscrewed the ECM Connector- Sprayed Contact Cleaner- Sat for about 30 minutes- Plugged both, back in- KeyON-START- -Started-right-up, like it had been running all along. Yea. Thanks to all of you that contributed to finally getting this Big-City, Country Boy, running and on-the-road, again. Thanks, again - very good-place; here. youngfred Link to comment Share on other sites More sharing options...
JMO413 Posted April 20, 2019 Share Posted April 20, 2019 Good to hear you got it fixed. Link to comment Share on other sites More sharing options...
Eagle Posted April 21, 2019 Share Posted April 21, 2019 11 hours ago, bbdude said: Hi nice rig! )) I have the 88 Comanche 4 lit short bed. Mine was in storage for 7 years as well. We by-passed relay on upper left side under hood to check the fuel pump if was working adequately and it turned out while it was pumping, it wasnt pumping enough, which explained the start temp but no idle for my situation; if that helps. )) One question if you good folks would be so kind, where on earth do you get the sending unit for this model? Does anybody have a suggestion? Mopar -no Dealer-no JCWhitney+Ebay+Amazon just generic-won't fit. Has anybody had any luck finding where one can get the fuel sending unit for 88 Comanche 4 liter? Thanks so much for your comment help in advance. )) This thread is about a no-start condition, and it has been resolved. You'll get more/better answers to your question about a fuel level sender if you start your own thread. I'm closing this one. Link to comment Share on other sites More sharing options...
Pete M Posted April 21, 2019 Share Posted April 21, 2019 1 hour ago, Eagle said: This thread is about a no-start condition, and it has been resolved. You'll get more/better answers to your question about a fuel level sender if you start your own thread. I'm closing this one. I split off his post into it's own thread and unlocked this one just in case something pops up. Link to comment Share on other sites More sharing options...
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