Ok....First I want to thank everyone for helping me chase down the leaking intake manifold gasket. That was a weird thing....
Now I have another issue that is driving me crazy, mostly because trying to find specific information on the net for a Chevy is nearly impossible (so much information you can't pinpoint specifics) I can't find the information I need for this damn 1989 Chevy 350 4x4. (ie, IAC counts, TPS voltage, test proceedures for various sensors, troubleshooting tree). If this was a Toyota or GN/TR I would have found it easily.
I timed the engine, adjusted IAC and TPS, changed the EGR, fuel pump relay, FPR and O2 Sensor. The problem: The truck barely runs in open loop, gray smoke, studdering and lopping. When it hits closed loop it starts and runs better. Once it is on the road it acts as if it wants to die. Then straighten's out then starts to want to die and sputter all over again. At first I thought it was the FPR, running rich and lousy....Changed that with no change in problem. Then I received a code 44 and 32 one is EGR and the other is an O2 lean condition, so I thought wow it is running like the EGR is cracked open, the EGR seemed stick and bind so I replaced the EGR and O2...Did this today with no results, thing runs horrible in open loop better in closed loop. I checked my timing, IAC and TPS, ran a vacuum test to see if I had vacuum leaks and I have 24-25hg in vac. Timing is dead on, I also tried unplugging the sensors one by one....coolant temp, O2, IAC..etc to see if one was causing trouble. I also readjusted my TPS and IAC, again!
Fuel pressure is my last test to perform, but not sure how to do it on a TBI system? I do get fuel and a bunch of it when I crank the engine over. The injectors seem to spit and sputter when it is in open loop. A ton of fuel once in closed loop. Once it warms up, I have an idle around 1500 RPM, (why I do not know)... I've looked at a couple of sites and seen that others have had the same exact problem, but nobody seems to reply with the cure.....Any help....What am I missing (pick up coil, fuel pump, egr switch, TPS, Map sensor, ECM)? Tough to find specific information on these chevys. If I had a good troubleshooting tree and specs on testing sensors I could rule out a ton of stuff. Troubleshooting an 86-87 TR is easy compared to this freaking thing.
Seems to have gotten worse by changing the EGR and O2, seems like I improve one thing and the system gets all out of whack. The factory idle setting and TPS were way off, but I set the TPS to .5v and the IAC at 700 RPM per specifications (no counts could be found on the net)....Help Please before I torch this damn thing
Thanks guys, sorry for being a pill.
Aaron
Now I have another issue that is driving me crazy, mostly because trying to find specific information on the net for a Chevy is nearly impossible (so much information you can't pinpoint specifics) I can't find the information I need for this damn 1989 Chevy 350 4x4. (ie, IAC counts, TPS voltage, test proceedures for various sensors, troubleshooting tree). If this was a Toyota or GN/TR I would have found it easily.
I timed the engine, adjusted IAC and TPS, changed the EGR, fuel pump relay, FPR and O2 Sensor. The problem: The truck barely runs in open loop, gray smoke, studdering and lopping. When it hits closed loop it starts and runs better. Once it is on the road it acts as if it wants to die. Then straighten's out then starts to want to die and sputter all over again. At first I thought it was the FPR, running rich and lousy....Changed that with no change in problem. Then I received a code 44 and 32 one is EGR and the other is an O2 lean condition, so I thought wow it is running like the EGR is cracked open, the EGR seemed stick and bind so I replaced the EGR and O2...Did this today with no results, thing runs horrible in open loop better in closed loop. I checked my timing, IAC and TPS, ran a vacuum test to see if I had vacuum leaks and I have 24-25hg in vac. Timing is dead on, I also tried unplugging the sensors one by one....coolant temp, O2, IAC..etc to see if one was causing trouble. I also readjusted my TPS and IAC, again!
Fuel pressure is my last test to perform, but not sure how to do it on a TBI system? I do get fuel and a bunch of it when I crank the engine over. The injectors seem to spit and sputter when it is in open loop. A ton of fuel once in closed loop. Once it warms up, I have an idle around 1500 RPM, (why I do not know)... I've looked at a couple of sites and seen that others have had the same exact problem, but nobody seems to reply with the cure.....Any help....What am I missing (pick up coil, fuel pump, egr switch, TPS, Map sensor, ECM)? Tough to find specific information on these chevys. If I had a good troubleshooting tree and specs on testing sensors I could rule out a ton of stuff. Troubleshooting an 86-87 TR is easy compared to this freaking thing.
Seems to have gotten worse by changing the EGR and O2, seems like I improve one thing and the system gets all out of whack. The factory idle setting and TPS were way off, but I set the TPS to .5v and the IAC at 700 RPM per specifications (no counts could be found on the net)....Help Please before I torch this damn thing
Thanks guys, sorry for being a pill.
Aaron