azdevil1981 Posted December 31, 2014 Share Posted December 31, 2014 I put a new fuel pump and mad sensor and still my truck won't stay running. 88 path 3.0 5spd.. help! Link to comment Share on other sites More sharing options...
kdj Posted December 31, 2014 Share Posted December 31, 2014 Might need some more info???? Link to comment Share on other sites More sharing options...
Precise1 Posted January 1, 2015 Share Posted January 1, 2015 mad sensor? MAF? Can you hear the pump run? If not, did you check the wires back there for voltage? Do the VG30i have the same fuel pump relay as a VG30e? Check that as well. B Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 2, 2015 Author Share Posted January 2, 2015 Yeah I can hear the pump run. It all started about when I was sitting at the stop light and the it died. I got it restarted but it ran rough. I get stay on the gas pedal to keep it running. I did put a new Max sensor first. I could spray carb cleaner in the throttle body at it would stay running that's why I put a fuel pump in it. I have had the injectors tested a few months back when I was having some issues. They were flow tested and checked out OK then. Link to comment Share on other sites More sharing options...
ahardb0dy Posted January 2, 2015 Share Posted January 2, 2015 have you replaced the fuel filter? Link to comment Share on other sites More sharing options...
Precise1 Posted January 2, 2015 Share Posted January 2, 2015 It certainly sounds gas starved, bit there are a few sensors that could be messing things up (O2, coolant temp, etc. Have you checked to see if there are any codes on the ECU? Have you checked connectors and jiggles wires? B Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 2, 2015 Author Share Posted January 2, 2015 Fuel filter is fairly new. Where is the temp sensor? Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 2, 2015 Author Share Posted January 2, 2015 I had another question. How hard would it be to convert TBI to mpfi for better fuel economy and reliability? Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 2, 2015 Author Share Posted January 2, 2015 I had another question. How hard would it be to convert TBI to mpfi for better fuel economy and reliability? Link to comment Share on other sites More sharing options...
Precise1 Posted January 3, 2015 Share Posted January 3, 2015 Well, you replace everything on the top of the block, the wiring harness, ecu and some misc electronics, fuel rails, etc. I haven't done it, but a few here have; it is best done with a running donor vehicle and is a fair amount of work. Fuel filter is fairly new. Where is the temp sensor? If it is the same as the MPFI units, it is in the side of the coolant port, top center of the motor. There will be two, the front being for the gause, the rear for the ECU IIRC. Sorry, I don't have any TBI diagrams to reference. B Link to comment Share on other sites More sharing options...
adamzan Posted January 3, 2015 Share Posted January 3, 2015 The TBI have a cylinder head temp sensor. Apparently it is a bitch to reach but doable with the right tools. Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 3, 2015 Author Share Posted January 3, 2015 Where is that? Link to comment Share on other sites More sharing options...
Kingman Posted January 4, 2015 Share Posted January 4, 2015 (edited) LH cylinder head behind the timing belt cover Edited January 4, 2015 by Kingman Link to comment Share on other sites More sharing options...
toughroad Posted January 14, 2015 Share Posted January 14, 2015 It could also be a faulty ignition system. Have tried pulling out some codes from the ecu? Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 14, 2015 Author Share Posted January 14, 2015 I'm just tried to follow the instructions on getting codes from the ecm, but but red and green lights are flashing Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 15, 2015 Author Share Posted January 15, 2015 Are both supposed to flash? Link to comment Share on other sites More sharing options...
Slartibartfast Posted January 15, 2015 Share Posted January 15, 2015 The ECU has five different modes of operation, and it flashes both lights together the number of times for the mode it's on, cycling through them until you select one. So they flash once for mode 1, pause, twice for mode two, pause, three times for mode three, and that's when you stop it to read the codes. I turned the screw again on mine, I assume you move the switch on yours. That should make it spit up its codes. Keep in mind that a bad sensor or sensor circuit won't always throw a code. If the computer isn't getting usable data from one of its sensors, it can (for some sensors) disregard that input and try to work around the problem. If it gets data, but the data is wrong, it'll try and adapt to whatever condition it thinks it's up against. If it's trying to idle in your driveway in Arizona, but a knackered sensor or faulty wiring tells it that the cylinder head is thirty degrees below zero, or the throttle is wide open, or something else along those lines, it's gonna have a bad time, and it probably won't be able to tell you why. Ain't OBD1 fun? Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 15, 2015 Author Share Posted January 15, 2015 Obd sooooo fun so what its doing or not doing Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 15, 2015 Author Share Posted January 15, 2015 The injectors seem to be not working. I have. fuel going into the throttle body Link to comment Share on other sites More sharing options...
Precise1 Posted January 15, 2015 Share Posted January 15, 2015 The write up for checking the ECU is in the Garage/How To section. It is not that hard to follow, and is better than nothing. Maybe it doesn't help, but it won't hurt. I do like OBD2 better, but your pay for it in systems and sensors as well. Injectors working or not? Seem to isn't much to diagnose from... Can you hear them clicking, smell gas, etc? B Link to comment Share on other sites More sharing options...
azdevil1981 Posted January 15, 2015 Author Share Posted January 15, 2015 So after it the mode flashes put the switch in the off position? Link to comment Share on other sites More sharing options...
Precise1 Posted January 15, 2015 Share Posted January 15, 2015 Honestly, I don't know. I don't own and haven't worked on the TBI system. Just follow the instructions... B Link to comment Share on other sites More sharing options...
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