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  1. 1980-'96 Bronco Tech
    I’ve had this issue where my bronco idles high in park. When I start it up I let it idle down which takes about a minute, it goes from about 900 rpm down to 500 which is normal. Then I go drive it for about an half an hour and park it it jump from 500 to about 1100 rpm. I wouldn’t think it’s a...
  2. Noobie Bronco Tech Questions. Flame free zone!
    Hello, I’ve had several issues with bad sensors and changed everything from VCM, IAC, MAP but not the EGR components. Idle bounces at a stop from 600-1000 rpm’s but it isn’t consistently happening. I’m also missing a hose that looks that should be connected to the vacuum tree on my 5.8. its...
  3. 1980-'96 Bronco Tech
    Hey guys, I have a 1990 Bronco with the 5.8 V8 that has rough idle thats intermittent. When it happens, the rpms oscillate from 400 to 1500 and the engine sometimes stalls. Im getting no OBD1 codes for both a KOEO and KOER test. Ive been searching for vacuum leaks and did find and repair a...
  4. Noobie Bronco Tech Questions. Flame free zone!
    Hello there! I have a 95 Bronco 5.8l automatic truck that I just pulled out of winter storage this week. This truck is high milage (284k) Im getting around to tackling some issues that have plagued the truck for a handful of months that I have been struggling to solve. The truck has had a...
  5. Noobie Bronco Tech Questions. Flame free zone!
    So I was having a lot of issues with the trucks idle I ended up replacing the TPS and the distributor which also ended clearing my check engine light! But it was running like a charm for a little bit and now back to experiencing some issues with the way it idles. I always start the truck and let...
  6. Noobie Bronco Tech Questions. Flame free zone!
    Hey Guys. On cold or particularly wet starts my CEL will blink 4 times, rev up to 1500-2000rpm, choke down to 300rpm, back to 1200rpm, then finally drift back down to normal 700rpm idle. All of this within 30 seconds. It's an '94 302 with OBD1, no stored codes or any issues during KOER or KOEO...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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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