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  1. 1980-'96 Bronco Tech
    Long story short, had crap idle, 14-15lbs of vacuum, and smoke test showed smoke pouring out of the tps and upper shaft spring area. I've disassembled the throttle body and it doesn't look like there's anything serviceable other than the two bearings. I imagine the brass shift normally seals...
  2. 1980-'96 Bronco Tech
    90 XLT, 351w E4OD. So I just finished installing a MAF kit from fiveology racing, along with 36lb injectors on an otherwise stock engine (heads/cam to come). Starts up just fine, but it only runs for about 5-10 seconds before slowly dying. If I blip the thottle, it bogs and dies. If I slowly...
  3. Noobie Bronco Tech Questions. Flame free zone!
    Im looking around the internet for some way to diagnose my map sensor just in case its the problem child of my idle. But all i find is using a wave lenght measurement to be able to diagnose it, any other way for me to check ? I know theres one where you pull a vacuum with a hand pump Also i...
  4. Noobie Bronco Tech Questions. Flame free zone!
    I just bought a 1991 Bronco Silver Anniversary with the 5.8 engine. When first started it idles fine but if I drive it at all and then put it in Park or Neutral the RPMs jump to 1500. Occasionally it won’t give me this problem. It seems to idle fine in gear when stopped. I’ve checked the IAC...
  5. Noobie Bronco Tech Questions. Flame free zone!
    We received our new Motorcraft IAC and installed it. We also installed the IAC Spacer Kit. We repaired the damaged IAC mounting threads with 6mm x 9mm Time Serts. All Throttlebody, IAC, and upper intake gaskets were replaced. The idle with IAC installed is 1200 RPM. The instructions that...
  6. Blog
    The TPS is a three wire sensor that measures the throttle plate opening and its rate of change. This sensor is a variable resistor, also called a potentiometer, that is directly linked to the throttle plate shaft. The TPS outputs a voltage directly proportional to the throttle opening. As the...
  7. 1980-'96 Bronco Tech
    Hi Bronco Tech. I introduced myself the end of last week with the post Got me a Bronco witb a problem. I got some feedback that it might be the choke and so I took it into the local tunex and had it adjusted... let's just say that I'm getting my money back. I guess it does start better, but...
  8. 1980-'96 Bronco Tech
    Couple of questions for you guys on an 86 EFI 5.0. I've been dealing with an erratic idle (revs up high for seemingly no reason, then down, then up, then decides it wants to stumble and or die) problem for quite a while now, and I'm finally fed up with it. I checked and cleaned the IAC, it...
  9. Noobie Bronco Tech Questions. Flame free zone!
    this is a 91 302 w/ E40D 4x4 4:10 axles w/ limited slip... its an f-150 with a 36xxx on the 5 digit odometer, but i dont think there are any differences that would change the diagnosis compared to a bronco we just bought it, so the history is vauge, plus the guy lied about at least 2 things...
  10. Noobie Bronco Tech Questions. Flame free zone!
    I just barely bought my bronco today it is a 1993 with a 5.8 351 and it was obvious that there was something wrong with the idle. Here is what happens I turn the beast on and it rises to about 2000-2500 RPMs and so i thought that maybe if i let it sit it will stop but it didnt so i tried to...
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