Truck stalls when warmed up, won't restart, and has fuel smell?
I will try to keep this as brief and to the point as possible, but I want include as much pertinent info as I can, as this is a truck I just spent 2 months working on and I need to get this thing sorted out soon, so please bear with me.
I bought my 91 5.0 in October. I drove 4 hours to see it. When I test drove it, everything seemed alright. After negotiating a price and handing over the cash, the seller walked across the parking lot to a gas station to wait for his wife to pick him up. Before heading out, I decided it was a good idea to stop by said gas station to fuel up before the long trip home. So, after filling up with fuel... the truck I had literally just paid for wouldn't start. It would just crank and crank. It also had a fuel smell under the hood. The seller came out and while he seemed surprised, I'm sure we'd all have our doubts to his sincerity in that situation... anyway, I had spent a long time looking for a Bronco, and this was unquestionably the best one I had found in my price range, and I wanted a Silver Anniversary, so I put a few bottles of whatever the gas station had as far as fuel system treatment in there, (I think it was STP) and kept trying. Eventually he was able to get the truck running, and the only thing he really did was throttle it. However, it would stall immediately unless he kept giving it some gas. So I hopped in, and after a few minutes holding the truck at 2000rpm, I was able to slowly bring the truck down to idle. But as soon as I shifted into Drive, it stalled. Again and again, same thing. After multiple tries, the truck FINALLY decided to keep running, and I was able to make the 4 hour drive home, without stalling.
When I made it home, I shut the truck off, and waited not even 5 minutes, and wouldn't ya know, it wouldn't start. The next day, in trying to go with the least intrusive approach, I tested and cleaned the IAC and the truck started right up (cold). It still, however, acted like it wanted to stall when shifting from Park to Drive, or Reverse. I knew this must be a relatively common problem on Broncos, because 2 of the 3 Broncos I test drove had the same symptoms. So I did a lot of searching on that subject, and found varying remedies. Some said IAC, some vacuum leak, some suggested that the trans filter could have dropped out, and I also read that the TPS could be a potential cause.
Upon inspection of my TPS, I found the insulation on the wires was chaffed, exposing bare wires. It was also kinda dirty and oily, and I found a new BWD TPS on eBay for $20 shipped, so I figured I might as well replace it. While I was waiting for it, well, one thing kinda led to another and I ended up cleaning the upper and lower intakes, painting them, and deciding to swap in some GT40P heads, among other associated parts...(so much for my least intrusive method...)
ANYWAY, after 2 months working on this thing, I was finally able to turn the key on it today. It started right up, everything looked good, and with the exception of multiple leaks from the pre-existing hacked together y-pipe, it ran great. It was idling at a rock solid 800rpm, and I was letting it get up to operating temp. Well, after about, I dunno 10 minutes maybe, it acted like it was going to stall, but didn't. Then not even a minute later, it did stall. I got back in the truck and tried to start it, but it just cranks... and there is a smell of fuel under the hood. I can hear the fuel pump kick on when I turn the key on.
If someone could help me out on this that would be great, I am really stumped here. I've also replaced the old injectors with the newer 4-hole style, fwiw.
| 1991 Silver Anniversary 5.0 | GT40P Heads | Ford Racing M-9430-T50 Headers | Mildy Ported Stock Lower Intake | Bosch EV6 Injectors | PCV Oil Separator | Smog removed | Jeg's 2½" Y-Pipe | Skyjacker Nitro8000 Shocks, Hydro7000 Stabilizer | Warn Premium Manual Hubs | E4OD w/B&M 70264 SuperCooler and Filter | LED Underhood Lights & Aux Driving Lights |