I have a 1992 Mazda B2200 p/u. It has a Throttle Body 2.2. It has approx. 157,000 miles on it. It has been running great but every once in awhile at any speed or RPM it would act like it's loading up. Then it would clear out and be fine. The other night while on the freeway It started hesitating really bad and wanted to die but I was able to keep it running till I got home. When I pulled in the driveway the under side of the truck was on fire and both the muffler and cat. Convertor where glowing red. The next day I disconn. The muffler from the cat. And started the truck. Raw fuel started dripping out of the cat. (Out the exhaust). So my question is what would cause raw fuel to come out the exhaust on this vehicle? This is my 1st time using this site so forgive me for not leaving a donation yet. I will definetly leave one when I see how helpfull this site is. Thank you
The only way that fuel is going to come out the exhaust is if the engine is not burning it. It could be something as simple as a dead spark plug. When was the last time you did a tune up, you know plugs, wires, cap and button?
If that is up to date then grab a spark tester to find out which cylinder is not firing.
BE CAREFUL! Catching on fire is not fun. I would get my hands on a fire extingusher first. You got lucky the first time, you probably won't the second.
June, 30, 2007 AT 10:24 AM
Thank's Dan, I just did a complete tune up about 4 months ago when I got it smoged. Within the year I did the following, I had the comp. Rebuilt, replaced the O2 sensor, replaced the cat. Conv, major tune up, replaced the fuel pump & filter, air filter. My thoughts where maybe the fuel pressure regulator, injectors, computer something causing it to run way to rich.
But I will check for spark. With that amount of fuel getting by it would have to be several cylinders not firing. Thank's again.
July, 3, 2007 AT 5:54 AM
Could it be that the injector is staying open all the time?
July, 4, 2007 AT 7:00 AM
Yeah, I'm sure that is possible. How do I check them?
July, 5, 2007 AT 7:41 PM
I am having the exact same problem. It started suddenly, the truck pours raw fuel from the exhaust. I tuned it up (trying to remedy the problem) and I found #1 and #3 plugs were soaked. I am getting good fire. I have a friend that swears it is a fuel press. Regulator but I haven't tried it yet. I have a Snap-On Solus diagnostic scanner but I'm not getting and codes.
July, 6, 2007 AT 7:01 AM
Checking the pressure is a good start. You could also check to see if the injectors are staying open on their own. This is what the manual states for checking the injectors for leaks.
1. Locate the circuit opening relay located behind the driver's side kick panel.
2. Start the truck and unplug the connector from the circuit opening relay. The engine should die within a few seconds.
3. Disconnect the fuel and vacuum hoses from the fuel rail. Unplug the injector electrical connectors, remove the bolts and remove the distribution pipe and injector assembly.
4. Wire the injectors to the distribution pipe so they don't pop off.
5. To check for injector leakage, connect the hose from the fuel filter to the inlet fitting on the distribution pipe. Using a piece of extra fuel hose and a coupler, connect the return hose to the fuel pressure regulator.
6. Place rags under the injectors. Turn the ignition to the On position and energize the fuel pump by jumping the fuel pump test connector terminals.
( I would plug the circuit opening relay back in)
7. Check for leaks.