Repost: power loss issue

[nativetexan]

tps; yes. fuel pressure; no. i think i did it right. i got the number 12 code, but that was it.

[nativetexan]

so i replaced the gas cap and fuel filter. it stumbled a little on start up, but i just kept the pedal down and it woke up. ran good for a few miles. then, after i got back in it, it was back at it. i think it is definately fuel relaated because it ran like a champ after the filter change.

[VileZambonie]

OK this is the last time I ask you this question.... DID YOU CHECK YOUR FUEL PRESSURE?!

 

[nativetexan]

tps; yes. fuel pressure; no. i think i did it right. i got the number 12 code, but that was it.

I haven't. Should I put a guage on it and get actuals or can I just unscrew the filter and see if I have flow?

[TexasRed]

For TBI, you need the fuel pressure reading right up to the tbi unit I believe. fuel pressure is a BIG deal with fuel injection.

[nativetexan]

Well, I took it in this morning to see if the guys at the shop could figure anything out. The dude wasn't too familiar with BI so I took his theory with a grain of salt. his theory (after watching the injector spraying) was that the injectors are spraying too much when I open up on it and it is causing the carb to flood. Is this a possibility? I am assuming that the computer is responsible for the amount of spray it is giving right? Or is it mechanical? Or is it possible that a sensor is sending a false reading to the computer and it is causing the computer to in turn push more fuel? he suggested that I should just 86 the TBI and get a 4bbl true carb and a mechanical fuel pump... That seems unneccessary.

[Grim 82]

In situations like yours I would ask myself "What would VileZambonie do?" and then go check my fuel pressure. 

[TexasRed]

lol . . . . love it. . . .4 bbl carb and mechanical fuel pump. new distributor too.

[Grim 82]

And a new block too, if his isn't cast to accept a mechanical fuel pump.

[Captkaos]

Or just a fuel pump...

[nativetexan]

In situations like yours I would ask myself "What would VileZambonie do?" and then go check my fuel pressure. 

Yes! My thoughts exactly... and I usually do, but, I don't know how to check pressure on a TBI setup? does anybody have any insight on this procedure?

[Captkaos]

you need a pressure gauge.  Any parts store should be able to get you one.  They have a specific one for TBI trucks.  It mounts in behind the filter on the tank side.  Remove the line from the filter, install the fitting, connect the gauge line and crank the truck.  It should be 12-15lbs.

[1979C20]

I don't know much about transmissions, but my friends 87 jeep grand wagoneer had a 360 and 3spd auto. Its kind of sluggish from a stop, and 2nd to 3rd, it either revs up super high and then shifts, like while getting on the freeway, or he has to let of the throttle then give it gas again and it will shift. People say it is the seals in the pump in the tranny leaking so it isn't pushing the gears very strong. Maybe change the tranny filter and replace the pump? I don't know too much about trannys, but that's similar to my friends jeep and that's what he's been told is wrong with it.

[nativetexan]

i think its an engine issue. i suspected the tranny at first, but it is shifting. its just not pushing power through the drivetrain...

[VileZambonie]

I don't know much about transmissions, but my friends 87 jeep grand wagoneer had a 360 and 3spd auto. Its kind of sluggish from a stop, and 2nd to 3rd, it either revs up super high and then shifts, like while getting on the freeway, or he has to let of the throttle then give it gas again and it will shift. People say it is the seals in the pump in the tranny leaking so it isn't pushing the gears very strong. Maybe change the tranny filter and replace the pump? I don't know too much about trannys, but that's similar to my friends jeep and that's what he's been told is wrong with it.

The vacuum hose probably isn't hooked up to the modulator.

Yes check your fuel pressure.