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Blazer ?'s

R

runninfromthelaw

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Ok guys and gals,

I built my Blazer about a year ago and now the gremlins have come out. So really quick history on it. The Blazer started as a 88' with a newer crate motor that now has about 30,000 on it. I swaped the tub from a 91' and did a small lift and running 35's. I have replaced the fuel pump and a few other items to make the 91' tub work.

So the problem's now are: 1. The Blazer dies at wierd times. I can be driving at highway speeds or at city speeds and feels like it runs out of fuel. Then some times coming to a stop it will die and takes a few trys to crank her up again, also when taking off from a stop. The thing thats weird is its interment so I'm thinking fuel then maybe spark? Any ideas

2. I had the 700r4 rebuilt and havent had any problems till just the other day. The trans is leaking like a crazy. I have norrowed it down to maybe the rear seal between the trans and tranfer case. Is it a common problem or sign of much worse?

Thanks for any info
 
When it dies you need to find out right then and there if it's fuel or spark and go from there. Otherwise you'll get it running again and have nothing to go on.

A leak between the trans/t-case is an easy fix. Clean surfaces and RTV black between the adapter and t-case. A new o-ring seal from the trans to adapter. You may not need to do both if only one is leaking.
 
What can I do at the time it dies to find out if its one or the other. I'm trying to hook up a fuel presure gauge to watch if its the pump. What would be a way to check if its spark. The times it seems to act up is when im away from the house and it on a dat to day thing with it. one day no problems and next it will die a few time trying to get it home.

Thanks on the leak info also
 
Easiest way, keep a long thin screwdriver with you. When it dies, pull a plug wire, insert screwdriver into the wire end and drape it over the valve cover. You don't want the metal to touch metal, leave maybe a 1/4" gap. Leave it somewhere you can see it while reaching in to turn the key. Watch for the spark.

Practice this before hand so you know what to do quickly while on the side of the road.
 
Ill try that to see. any ideas if that would be the whole distibutor if its parts, any ideas why it does it then will work later.
 
Ignition module failure. It can heat up and stop working then start working again after it cools down.

I've seen fuel pumps do similar things too, along with fuel pump relays.

If you feel like throwing money at it and hoping for the best, start with a new ignition module. It resides under the dist cap and rotor. Not hard to replace, be sure to use the grease on the bottom "heat sink". It should come with the proper grease.
 
could be the rubberline in the tank too. my dads truck ran like that before he checked in the tank. dropping the tank is simple usually
 
shady said:
could be the rubberline in the tank too. my dads truck ran like that before he checked in the tank. dropping the tank is simple usually
Click to expand...

Exactly my point, there are several issues that will cause what the OP describes. Start by finding out if you're losing fuel or spark and go from there.
 
You could also get a cheapo inline spark tester. Plugs in between plug and plug wire. They will melt over time, but should be ok for want you want to do. You should narrow it down to spark or fuel, before you light the fuse on the parts cannon.
 
Ok so the fuel pressure is fine and voltage to the pump. I replaced the fuel filter just to be sure.

The spark is what I'm thinking now. I drove it for about 10mins with no problems. then when it starts to warm up thats when it starts to surge and die. It runs fine at idel, but as soon as I'm at lower rpm's even on the road it starts to surge and die.

I'm going to swap out control modules this afternoon and see if thats it.
 
As far as the trans goes if it is really pouring it out you may have pulled the threads out of the trans, pretty common with our trucks.

Its not a big deal pull the trans an helicoil the holes. I have had to do it several times.

It will be the 4 bolts that go through the adaptor to the trans that pull out
 
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