88TATBI5.7

Ok so this started 2 days ago. last week i did a full tune up minus the O2 sensor. So i started my car the idle when to 1500 down to 300 and back and forth till it stalls. if i take it out for a ride it has no power till it gets over 2000. im not sure what the problem is. iv cleaned the iac. have a tbi rebuild kit on the way. my car is a stock 88 tbi, i dont even have an exhaust. thanks for any ideas.
also it isnt throughing codes.

xlwhellraiser

iTrader: (1)

I kinda have the same problem. I talked to a guy who knows every single part of an f-body and he told me few things.

-- If you are not getting any codes than your sensors should be fine.
-- If the pumps go out, they go out and don't go in and out!

-- A clogged cat does make problems like you are describing.

I have a brand new high flow cat and it seems like the sucker is clogged.

I'll try to get my cat gutted and we'll go from there.

88TATBI5.7

yeah iv been thinking the cat is een getting a little clogged but the car didnt have any problems. but my muffler fell off like last month and the car is still quiet. so i guess while im getting the muffler i should do the cat.
i noticed it ideled smooth with the map unpluged.
unpluged the iac and the idel was smooth but steadily increasing. cleanied the egr just to make sure. just running out of ideas.
ill look into the cat

the car for a while when i started the car sometimes it would drop the rpm to the point it almost stalled, sometimes it would stall. these instances were did not happen alot.

xlwhellraiser

iTrader: (1)

I've had some stalling problems, but like your said, they were few and far in between.

I am really starting to think its the cat since my headers leak out of every possible little imperfection on them. My car does still sound loud though. I went out and I replaced my CTS which is located right next to the waterneck and helps computer controll the idle when warming up. That replacement defenetly helped me out with idling.
Now, if your car is warming up more than it should than you can safely assume that its the clogged exhaust.


In my case, the problem is that I just got the magnaflow cat installed and it worked great for a while, and now it seems as if its clogged. I am going to get AFPR(adjustable fuel preassure regualator) on the TBI and bump up the preassure a bit. So I don't run lean and ruin another cat.

With all of your problems I would suggest that you drive your car like a grandma if you have to. Take care of her, and she'll take care of you.

88TATBI5.7

just to be safe its not a sensor im going to change them one by one with the ones on my second tbi. i think i need a new iac though. the nubs are somwhat worm away so the pintal shaft can spin not freely but can spin alittle. ill let you know.
i dont think its my cat because if i get it going to like 2500 rpm it will actually get more power.
i just dont know what i did to **** my car off.
all i did was start working on my blazer. time to remove and install the tranny again. iv done this to many times. first the tranny went. then i rebuilt nothing but problems went to a th 350 instead of a 83 700r4(worst piece of garbage iv ever had). i love the 700r4 but only after gm refined them in 87.
anyway good luck with your car.

edit

it warm up fine like normal maybe a little slow. doesnt get any warmer than normal. 180 if i turn the fan on early and 220 if i let the fan switch do it.

scooted45

I have the same problem but I took a sawzall to my y-pipe, still no improvement (just louder) maybe check your ignition and timing.

88TATBI5.7

im thinking mine is the pump. i would check timing but i cant get the idle to steady enough to check it. my cat is off too. no improvment but i need and exhaust but i might just through mine back together leaks and all till i get it running right.

my car is on the back burner. im finishing fixing my blazer.
83 s10 with 4 wheel drive. i installed a 305 and blew the 700r4. rebuilt a th350 installed destroyed the flex plate. just getting it back together now. i need a car and a carb never has these kinds of problems. and i cant get rides from my friends for ever.

But i have a tbi rebuild kit and a pressure testor on the way so once my truck is done ill be working on it. it just hurts when one breaks and then the one you depending on starts acting up.
hopefully soon ill have both of my rides up and going again.

I was reading some old posts that said it might be the fuel pump but i have no way to test it yet. good luck and ill let you know when i figure this out.

xlwhellraiser

iTrader: (1)

Ok, idle and dying really sounds like a bad IAC, just get a new one. Or clean the old one.
A bad TPS does some of the things you described.

I kinda have the same problem, but my idle is quite good, however sometimes when I shift into gear my car would die. Very rarely but happens. Just put it back in drive and starts up immidiately.

Did you try to adjust you TV cable. Sometimes a very messed up TV cable can give you driveability problems.

THe fuel pump is defenetly a big thing to think about. Maybe you are just not having enough preassure in the TBI!?! What you can do is either get an adjustable (fuel preassure regulator) or make your adjustable. Its pretty easy.

Bump up the preassure and see what happens.

A preassure guage will help too.

If all fails get a carb, and your pump will be more than enough for it!


Bye bye MPG!

(Well I guess you can tune it to get you good MPG)

88TATBI5.7

Yes this is a tbi set up. well iv changed my iac tps map, ignition is strong so i left it. didnt buy these parts i took them from my donor car. fuel press. guage is in the mail. when i find out if its fuel im going to rebuild my tb. the tv wouldnt have anything to do with whats going on. its not drivable anymore. it starts surges till it stalls, if i play with throttle keep it at 1000 rpm i can keep it running for a bit the it starts surging again.

my blazer is carb on a 305 and has ok milage but with the th350 i went out the door. with 3.42 in the rear it gets 15 highway.

im keeping tbi but these things are hard when both of your cars die at the same time. blazer will be done tomarrow. then comes the figuring out whats with my car.

88TATBI5.7

ok say so i a tbi pressure gause on my car and found out i have 0 psi. so that leads me to myquestion will a car start on 0 zero psi. becuase my car starts and if i keep it above 2000 rpm will still surge a bit here and there. but it will stay running. if i press the pressure bleed off i get a dribble out of the clear hose. im going to check my relays and wiring but i dont think thats the problem.