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Blazer keeps dying...fuel problem??

9

90blzr

1/2 ton status
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Mar 25, 2001
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Location
SO CAL
90k5, 350TBI, 241/700R4.

Driving the blazer and all the sudden it starts acting like its out of fuel. Runs great for a few minuts then while going down the road it loses power, almost dies, spits and sputters then dies. Would restart, just turn over. sometimes it starts right back up, sometimes it has to sit for a while. Finally started up, same thing. Will idle all day long, but start getting on the gas and it will start to die out, like you are running out of gas until it finally dies.

Replaced fuel pump and fuel filter. Started right up, got about 1/2 mile, running great, then all of the sudden the same thing. Got it started and then idled my way in 1st gear back to the house.

Any ideas?? I thought for sure my fuel pump was taking a dumb, but appartently that wasnt it. Unless my brand new fuel pump is bad?

Thanks in advance.
 
Does it key up the relay before starting and continue after you turn it off?

Make sure your filter is on correct way, but it sounds to me like you are already in the ball park from what you are telling us...
 
I was once told to drive it, unplug the coolant temp sender and drive it again, If it is better w/o it, it is bad. Unfortunately I don't remember if it matters if should be hot or cold:doah:
 
By keying the relay, if you mean can I here the pump turn on for a few seconds right before starting it, yes I can, then it goes off like normal until the truck starts.

Fuel filter/pump is in correctly, it did the same thing with the old filter.

Coolant temperature sensor... hmmm.

Thats at the front of the motor, correct?
I had one go bad before, but it would just idle really high and not come down, basically telling the computer that the truck was cold all the time.

I can try the coolant temp. sensor if that sounds like it could be whats causing this. I never thought of that.

What sucks is I have to actually take it out on the streets to drive it, if it dies, I'll probably be stranded:laugh:
 
I had my TPI act somewhat similar to that once. It ended up being a bad pickup coil in the dist. I could drive the truck like 30 miles and then it would start sputtering like it was not getting fuel, it would run real rough and die. After I let the truck cool off for about 20 minutes it would startup again and run fine for another 30 miles and bam it hit again. I did the 30 mile shuffle for 200 miles on my way back from Spring Break in Havasu, AZ. Let me tell you that is fun.

I thought at first it was my fuel pump when it died the first time. I switched it to the spare on the side of the road. It did it again in 30 miles so I switched all my relays for the TPI system. 30 miles later it did it again. I switched in my spare coil & ignition module. 30 miles later it did it again.

Now I had replaced everything in the fuel system & ignition except the pickup coil so I knew what the problem was. Problem is I wasn't going to rip the dist out on the side of a major interstate to install a new pickup coil. I did the 30 mile shuffle the rest of the way home. :crazy:

Harley
 
Possibly the fuel pump relay, but I'd also look at the Ign coil, pickup coil, and module. They all go out at some point.

FWIW, I've run TBI engines with broken temp sensors, w/o issue.
 
Hossbaby50 said:
I had my TPI act somewhat similar to that once. It ended up being a bad pickup coil in the dist. I could drive the truck like 30 miles and then it would start sputtering like it was not getting fuel, it would run real rough and die. After I let the truck cool off for about 20 minutes it would startup again and run fine for another 30 miles and bam it hit again. I did the 30 mile shuffle for 200 miles on my way back from Spring Break in Havasu, AZ. Let me tell you that is fun.

I thought at first it was my fuel pump when it died the first time. I switched it to the spare on the side of the road. It did it again in 30 miles so I switched all my relays for the TPI system. 30 miles later it did it again. I switched in my spare coil & ignition module. 30 miles later it did it again.

Now I had replaced everything in the fuel system & ignition except the pickup coil so I knew what the problem was. Problem is I wasn't going to rip the dist out on the side of a major interstate to install a new pickup coil. I did the 30 mile shuffle the rest of the way home. :crazy:

Harley
Click to expand...

Hmmmm....I may have to try that. It doesnt even go 30 miles. I'll be driving fine then its like you let your foot off the gas, even though its still on, then spits and sputters for a few seconds then thats it. But yeah, I had to let it sit the first time. It died on me in the middle of a MAJOR road and I actually had to get it towed because I had restarted it four or five times to try and get off the road, finally it wouldnt start anymore. Got it towed home, got it off the tow truck and it started right up:doah:
You have to take the distributor out?
 
To replace the pickup, yes you have to take the dist out. What part of Socal are you in?

Harley
 
The pickup sensor goes between the dist body and the drive shaft inside that the rotor presses onto/ spins on, so yes, you have to pull the dizzy, then remove the gear, to get the shaft out and replace the ring. Pretty common problem. I've had a bad coil do the same thing, though. And so will a module, under the right circumstances.
 
bowtiepower00 said:
The pickup sensor goes between the dist body and the drive shaft inside that the rotor presses onto/ spins on, so yes, you have to pull the dizzy, then remove the gear, to get the shaft out and replace the ring. Pretty common problem. I've had a bad coil do the same thing, though. And so will a module, under the right circumstances.
Click to expand...

Okay, I gotcha. The ignition coil and module are actually pretty new, MAYBE 1000 miles on them, probably alot less though. So fuel pump, fuel filter, ignition module, ignition coil all been replaced. Maybe I can get by the parts store tomorrow and pick up a pick up coil and try that.

Guess it could be a relay too...located with the fuses?
 
Vapor lock, fuel atomization before it hits the injectors. Acts like a lean or no fuel condition. Are you running an in-tank pump? they don't usually vapor lock.
 
bent72 said:
Vapor lock, fuel atomization before it hits the injectors. Acts like a lean or no fuel condition. Are you running an in-tank pump? they don't usually vapor lock.
Click to expand...

Yeah the pump is in the tank...
 
Not sure on the Blazers, on the IFS rigs they're on the firewall IIRC. I've had vapor lock issues with TBI, as well, but only when trying to start a hot engine. It only happened for a short while and ended up fixing itself, though.
 
picked up a coil a little while ago and got the distributor out. Got the gear off...is it okay to reuse the rollpin that holds the gear on? I didnt damage it.
So I got the gear off and the shaft comes about half way out....then stops. Should it come all the way out no problem or Does that square 'clip' that is up on top of the pick up coil have to come off first, if so, do you just 'pry' it off or??


Thanks!!
 
Yes the roll pin is ok to reuse. Yes the shaft should come all the way out of the dist. Yes the square clip needs to come off the pickup coil but It shouldn't stop the shaft from coming out. You just carefully pry it off and use the new on provided with the new pickup coil.

Twist the shaft as your pulling it out. It should slid out but you may have to use a little force to get it out.

Be careful with the little metal ring that has the pointer looking things on it. It is fagile and will create a ton more problems if you crack it and don't know it trust me, it learned that one the hard way.:D

Harley
 
Okay, put the pick up coil in and it started right up as usual. gave it some gas and all was good. Took it down the street and as soon as I gave it some gas it cut out again. I can idle and go EASY on the gas and it is fine. I can also EASE into the gas and pick up speed, but normal acceleration or hammering down, it just cuts out and wants to die. I let off and it runs smooth again, give it gas, and cuts out.
So needless to say, I idles in gear giving it as little gas as possible back up to my house.
Back to square one:crazy:
At least I know the pick up coil is good for a while and I now have a spare fuel pump and pick up coil:D

Oh and I tapped on the cat and it didnt rattle at all, sounds hollow...
 
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