Frank is a whore...

Okay, up until today my truck has gotten awesome mileage. 25-27 on average, with mostly town driving. However, today I used a 1/4 tank in about 40 miles (11 gallon tank). Now, I have had a light exhaust leak for about a week. As of this morning, its a big exhaust leak. Its right at the head. One of the studs stripped out, and it blew the gasket apart today. I got some new helicoils to fix that one, and all new studs. As well as ordering a stamped style gasket, versus the Thorley gasket, which I have heard suck anyways. So I will probably be able to fix that this week.

But I'm wondering if a bad exhaust leak can cause shitty mileage? I'm fixing it regardless, because its annoying as shit, but curious if it could affect the way the motor runs? My truck also feels like it has a little less power at low RPMs, and smells like raw gas when I take off from a stop. It also was gutless this morning on cold start.

Someone suggested I may have picked up a fuel leak somewhere since it so abruptly got shitty mileage. I looked over every line, and everything is dry. Only other thing I can think is its running to rich now, but why would it change overnight? And Toyota carbs aren't widely adjustable. Theres a fast idle screw, and an air screw, thats it. I haven't had much time to mess with it really, so I will look closer tomorrow. But what I've gathered so far makes me wonder.. Any help, appreciated.

sounds like a sticky choke seth

my father and i rebuit a 85 carbed bought it in nevada. brought it down to sac ran great 22-23 mpg (4x4). it got hot out started running fat then lean and was just a biotch. just like that it got 15 mpg running great then just chocked. had a good friend go through it after about 6 hours of screwing with it. ran great till we sold it. find a good shop manual and rebuild and adjust. hope this helps

Originally posted by low downin



my father and i rebuit a 85 carbed bought it in nevada. brought it down to sac ran great 22-23 mpg (4x4). it got hot out started running fat then lean and was just a biotch. just like that it got 15 mpg running great then just chocked. had a good friend go through it after about 6 hours of screwing with it. ran great till we sold it. find a good shop manual and rebuild and adjust. hope this helps

My carburetor is rebuilt, and has about 4,000 trouble free miles on it.

It was really hot today, which was odd since its cold season, but I don't think that really has anything to do with it.

had a problem with a lil diaphram in the carb which was $15 from toyota and they knew right away what i was talking about it had a little hole in it allowing mine to run rich was a cheap simple fix maybe worth trying ......killer truck btw

Nice model. Lol.

I will check the diaphram. I thought about that. I do have an extra one as well.

my jeep had an exhaust leak and it had the same symptoms, fixed it and it ran a TON better.

you are losing back pressure and causing shitty milage. thats why some vehicles run like shit when they have no exhaust.

Originally posted by Pootus



you are losing back pressure and causing shitty milage. thats why some vehicles run like shit when they have no exhaust.

Thats what I wanted to know! I wasn't sure if a big exhaust leak would cause it, thats why I asked. Well ass soon as my new gasket shows up I'm fixing this shit. LCE is pretty close so hopefully soon.