OK all, this is outside of the ones I know how to work on…..
My son as a 96 OBS Truck with a 97 OBS PSD installed. It has having a hard start issue. One odd thing about it is, ambient temp does seem to make a difference, but it doesn’t seem to be because of the Glow Plugs.
He picked it up last fall when it was “cool” out 40-60 degree temps… it would start and run like you would expect. On the first colder day, it did not want to start. Crank and crank, but no start. He called me over, and I helped him out. It was plugged in (we think the block heater works). You can hear the glow plugs cycle like they should. Again, crank and crank. I even manually activated the glow plugs with the relay, wouldn’t start. So we disabled the GP’s and grabbed the Cosby….. it took a bunch of cranking even with gentle use of Cosby to actually get it to start. When it did start that time, it was running slower than idle and he had the throttle held to the floor…. It took 30-40 seconds of that before it gained RPM and the once the RPM came up, it would idle. Next morning, it would start and run like it should. However, if you let it sit for 12 or more hours, back to the same thing. Crank no start. He has another vehicle, so for the winter, he parked it out of the way. The bing thing we saw, is if it was cold, (air temp) it just would not start.
He tried a few weeks ago on a slightly warmer day, and he finally got it started after way too much cranking. He let it run, got everything up tp temp and it seemed fine. It was not at his house, so he tried the next day, a bit cooler day, and wouldn’t start.
Yesterday he tried again, it was in the 60’s here. He did get it started, but it took 6-8 minutes worth of cranking cycles to get it to run. Once it caught, it ran and idled fine. He drove it home yesterday, and it ran fine, once he got it started. He tried it last night before bed 10ish, so it had been sitting 5-6 hours, and it started right up. 6:30 this morning, it fired right up and he drove it to work. Same this afternoon, after sitting at work 8.5ish hours, started up and he is out and about in it now.
We are trying to figure out what it may be. We have not put a scanner on it, (I have a bully dog to pull codoes on my 6.0, but it doesn’t work on the OBS). I don’t think it is glow plugs, since Cosby doesn’t do anything either. It was converted to some electric pump setup (the more we look at it, the less and less we like it). It has filters and the pump on the frame, and no bowl or the other stuff in the valley. He is wondering if it could be the HPOP draining back. He checked once and it looked like the reservoir was within an inch of the plug….. could it be something else. Ambient temp seems to make it start, a bit easier…. but still has that extended crank if it sits “too long”
It’s a 96 F-350 (97) 7.3 PSD, E4OD, 4x4, Extended Cab, Dually. Not sure of the miles on the engine, since is has been swapped.
We are just trying to get some idea of what to look at. Other than that one time it didn’t want to idle, once it starts, it runs fine, has proper power, no funny noises. It is just if it sets too long, hard start we are trying to figure out…. With it being able to sit 8ish hours and start, it should be “cold” by then….. so that steers me away from the normal glow plug issues one would think, and the block heater or ether don’t help it start when it does this…
My son as a 96 OBS Truck with a 97 OBS PSD installed. It has having a hard start issue. One odd thing about it is, ambient temp does seem to make a difference, but it doesn’t seem to be because of the Glow Plugs.
He picked it up last fall when it was “cool” out 40-60 degree temps… it would start and run like you would expect. On the first colder day, it did not want to start. Crank and crank, but no start. He called me over, and I helped him out. It was plugged in (we think the block heater works). You can hear the glow plugs cycle like they should. Again, crank and crank. I even manually activated the glow plugs with the relay, wouldn’t start. So we disabled the GP’s and grabbed the Cosby….. it took a bunch of cranking even with gentle use of Cosby to actually get it to start. When it did start that time, it was running slower than idle and he had the throttle held to the floor…. It took 30-40 seconds of that before it gained RPM and the once the RPM came up, it would idle. Next morning, it would start and run like it should. However, if you let it sit for 12 or more hours, back to the same thing. Crank no start. He has another vehicle, so for the winter, he parked it out of the way. The bing thing we saw, is if it was cold, (air temp) it just would not start.
He tried a few weeks ago on a slightly warmer day, and he finally got it started after way too much cranking. He let it run, got everything up tp temp and it seemed fine. It was not at his house, so he tried the next day, a bit cooler day, and wouldn’t start.
Yesterday he tried again, it was in the 60’s here. He did get it started, but it took 6-8 minutes worth of cranking cycles to get it to run. Once it caught, it ran and idled fine. He drove it home yesterday, and it ran fine, once he got it started. He tried it last night before bed 10ish, so it had been sitting 5-6 hours, and it started right up. 6:30 this morning, it fired right up and he drove it to work. Same this afternoon, after sitting at work 8.5ish hours, started up and he is out and about in it now.
We are trying to figure out what it may be. We have not put a scanner on it, (I have a bully dog to pull codoes on my 6.0, but it doesn’t work on the OBS). I don’t think it is glow plugs, since Cosby doesn’t do anything either. It was converted to some electric pump setup (the more we look at it, the less and less we like it). It has filters and the pump on the frame, and no bowl or the other stuff in the valley. He is wondering if it could be the HPOP draining back. He checked once and it looked like the reservoir was within an inch of the plug….. could it be something else. Ambient temp seems to make it start, a bit easier…. but still has that extended crank if it sits “too long”
It’s a 96 F-350 (97) 7.3 PSD, E4OD, 4x4, Extended Cab, Dually. Not sure of the miles on the engine, since is has been swapped.
We are just trying to get some idea of what to look at. Other than that one time it didn’t want to idle, once it starts, it runs fine, has proper power, no funny noises. It is just if it sets too long, hard start we are trying to figure out…. With it being able to sit 8ish hours and start, it should be “cold” by then….. so that steers me away from the normal glow plug issues one would think, and the block heater or ether don’t help it start when it does this…
