|
Post by K5 on Aug 2, 2006 23:47:17 GMT -5
Ok, heres the problem:
When i'm out on the trail and I start bouncing, it seems like the carburetor floods and I have to ride the gas pretty hard to keep it going. This also happens when I'm going up steep hills. I have a feeling it is the float. Any ideas?
|
|
|
Post by yotamaster on Aug 3, 2006 0:20:39 GMT -5
I hate to say it bro, but it's the nature of the beast. Some carbs don't like to leave flat ground the only thing I would suggest is looking into a offroad carb. Something that can handle some of camber sitautions. But that's only my opinion. Now on the other hand you could put a TBI kit from a knew blazer. Maybe buy some of the parts from a junk yard and save some money. Just a thaught.
|
|
|
Post by K5 on Aug 3, 2006 1:15:39 GMT -5
Ya, that what I'm starting to think. I think I am going to rebuild it though. When I bought this truck it was beat to hell so I don't think it would hurt.
|
|
|
Post by rstep on Aug 3, 2006 8:05:26 GMT -5
Kyle what carb you running?
|
|
|
Post by ecameron87 on Aug 3, 2006 10:25:02 GMT -5
You probably have a Rochester Quadrajet (Q-Jet) if it is still the stock carb. In my opinion, this is still the best off road carb out there. I have tried the Holley Truck avenger before and it sucked on any angle. The Quadrajet has a "center hung" bowl and if calibrated right it will work better on angles than any other carburetor. The problem is it takes a lot of know-how to tweak it right. If it starts to chug on you at angles, then start feathering the throttle and it usually keeps the engine alive. The hesitation on bumps is a curse from the carb gods, although it should only be a minor hesitation. Here is a good off-road carb test that I have read before. www.4wheeloffroad.com/techarticles/off_road_carburetor_review/You can buy modified Q-Jets, or get it professionally set up. Either way, it is still a carb and you can get it to run pretty good off road, but it will never run great.
|
|
|
Post by slick1100 on Aug 3, 2006 11:32:48 GMT -5
I'll put my $.02 in and agree with the carb not being ideal for offroad, though it can certainly be made to work. From what I've read, carbs can be subject to fuel starvation, though the problem may also lie with the fuel pickup in your tank. When I was working on an old car project I ran across a reservoir for Ford Broncos for off-roading designed to keep positive flow in off-camber situations to prevent fuel starvation. It was specifically designed for fuel-injection conversions, but the principle of fuel starvation from the tank is the same for carbs as well. I won't try to draw the schematic on here, but the idea was to have fuel go from the tank to the reservoir and then to the carb/injectors. If the normal fuel pickup in the tank was starved of fuel from the fuel sloshing away, a check valve closed to prevent the reservoir from back flowing to the tank, and the engine ran off the bottle. Only reason I even bring it up is that I had a car that starved when the tank was less than 1/2 full if I was going up or down a steep hill. The pickup drew from the center of a 25 gallon tank, and there was enough room for the fuel on either side of the pickup at those angles. It was quite frustrating!
|
|
|
Post by spinnas on Aug 3, 2006 11:55:56 GMT -5
I 200% agree with ecameron87. I have tried them all, and trust me, they all SUCK. Holley Truck Avenger, both sizes, Edelbrock Performer Q-Jet, Edelbrock AVS, Holley 750, none of them worked. I rebuilt my old Q-jet, turned it in, and it runs better than all of them ever could dream of. I also run a spring loaded needle and seat which helps. The only time my carb craps out on me now is when I'm at 45 degrees or more going up. It never craps out sidehilling at all.
|
|
|
Post by K5 on Aug 3, 2006 15:46:25 GMT -5
Kyle what carb you running? I'm running and Edelbrock. Can't remember which model. It was on there when I bought the truck. I'll check which model when I get home.
|
|
|
Post by K5 on Aug 3, 2006 15:47:54 GMT -5
Maybe I'll switch back to a Rochester Q-jet. I'll have to read about it. Thanks for all the info.
|
|
|
Post by rstep on Aug 3, 2006 16:32:16 GMT -5
More then likely it's a 1406 or 1405 even after adding all the off road stuff we had nothing but problems on one of the blazers in the group. Q-jet will do good for you off-road.Not many people agree but I've been running a holley 600 on my 401 now for 4 years and haven't had a bit of issues off road. Summit has a nice Q-jet not bad in price running one on my GMC but it is a street truck.
|
|
|
Post by spinnas on Aug 3, 2006 16:54:21 GMT -5
More then likely it's a 1406 or 1405 Translation, not an off-road carb. The 1405 or 1406 if it is one of those is a street carb. I've seen some Holley 600's do ok offroad like Chivo, Charouleau, but anything with steep stuff they have failed.
|
|
|
Post by fnlrno on Aug 3, 2006 19:32:59 GMT -5
Somewhere I used to have 4 q jets laying in a bucket. Unfortunately every once in a while my kids get attitudes and go above and beyond the call of duty when I ask them to do chores. SO I'm gonna guess when I asked to clean the garage last time they pitched them to get back at me.........
By the way edlebrocks are great carbs, just not on blazers when they're off roading. Even with the mods and float settings.
|
|
|
Post by madein78 on Oct 12, 2006 19:14:30 GMT -5
i run a carter 625cfm it is the same as a edelbrock 650. my third afb carb i ve ran on various vehicles. all i usually do is run the spring loaded needle kit i think the part number is 1405 or something. it works great. also it is very important that the floats are set up to specs it is very easy for these floats to be a little off. also make sure the bowl baffle is installed. i ran a holley double pumper once but it practically died over every bump. i have no problems unless im really at a steep angle, and it won't die but run reallly crappy, with no power. let me know, i can help you out with the spring kit if you want. not sure what edelbrock your running though
|
|
|
Post by K5 on Oct 12, 2006 20:42:27 GMT -5
I should be getting fuel injection next week, but thanks for all the info.
|
|