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  1. Looking to buy, says lean needs tune

    4.6L Tech
    Im going to go look at a 2000 mustang 4.6L tomorrow and was told that the car starts no problem and drives as well as will pass a safety inspection but doesnt recommend driving it because of the mods making it run lean without a tune. This doesnt seem right to me that the mods he has would make...
  2. Cold lean condition/misfire

    2005-2010 Mustang GT Tech
    On cold starts, my car misfires while accelerating. I have a wideband that I know is accurate, so I know it is leaning out. Knowns: Directly related to heat Symptoms dissappear after car heats up Symptoms are less severe/last less time when the car has been sitting outside in the sun all day...
  3. Need voltage output from 02 sensors.

    5.0L Tech
    Wideband O2 to AFR controller to ECU Hey guys. I installed my MXT-L AFR controller along with a bosch style wide band in my driver side bank. I need to know the voltage output from my o2 sensor that my ECU needs to read lamda (or shall I say lean/rich) as I can define this in my controller...
  4. 98 coobra running lean? normal?

    SVT Cobra Tech
    So i went to a dyno day found that my air fuel ratio was at 14.7 average. well found out that the previous owner installed an aftermarket maf housing and my tune wasn't set up for it. well ordered the correct tune. and got a wideband air fuel gauge. well at idle it maxes out to lean 22.4 then...
  5. 1991 5.0 camshaft/fueling problems

    5.0L Tech
    Hello, first of all mine is a 91 f150 with a 5.0 and hopefully I don't get booed out of here for that but I really need help. I recently rebuilt my engine with new everything a bigger .485 intake and exhaust cam, ported upper and lower intakes and heads, and shorty headers. I kept the obd-1 as I...
  6. Bad fuel pump or?

    4.6L Tech
    Hey guys, I think I'm getting close to solving my problem on my 04 GT. After doing as much as I could before taking it to the stealership I had to break. The first two days they had it they couldn't find anything, today the foreman tracked my problem down to a bad fuel pump. My problem is...
  7. maf 88 throttle body questions

    5.0L Tech
    Hello all. I have a mostly stock 88 gt (except for 2.5 inch pipes, cold air intake, maf conversion), and I'm have missfire problems. The car has ALL new engine control sensors that I've steadily replaced during the 2 years I've owned it. There is a vacuum leak in the throttle body body where the...
  8. 2004 Mustang GT running lean, rough idle, loss of power

    Hello everyone. I'm new here so bare with me but I will be extremely grateful for any help I receive. I got my 2004 GT about a month ago and it has roughly 190,000 miles on it. It started with code 0301 (misfire on cylinder 1) so I replaced the coil and plug, problem solved. Shortly after it...
  9. Two Codes P1181 and P1151 Help Please

    4.6L Tech
    Hi guys im new here and today my check engine light came on. I bought a stack racing plenum from american muscle and put it on and this codes came on and called americanmuscle and they said the codes came on because i needed a tune. I bought a sct tuner and the codes went away for a day then...
  10. 91 mustang a/f ratio starts ideal then shoots to rich

    5.0L Tech
    I purchased a 91 mustang 5.0. I have been having so many issues with it wish i didnt buy it. Anyway i keep getting code 41 and 91 so i bought a a/f ratio gauge to see what its doing. I hooked it to the passenger side o2. When i first start the car it sits on ideal but after 1 minute it spikes...
  11. BBK CAI and running lean?

    4.6L Talk
    I am thinking about purchasing a BBK cold air intake for my '02 GT, however because it does not require a tune, should I be worried about running a little lean? And if so, is it enough to damage anything?
  12. 1996 Mustang V6 engine shaking and rough idling ! Injectors next?

    V6 Tech
    Im new to the forum. Hopefully I can get some help and help someone along the way. Recent owner of a Mustang. I recently bought a 1996 Mustang V6 that needs a little bit of work (great deal, so it's worth it). Engine is shaking when idling so I have checked the ignition coil, spark plugs, spark...
  13. 98 Mustang 02 Circuit Malfunction, Running Lean, Excessive Black Soot in Exhaust?

    V6 Tech
    Hey Guys, I'm back to pick some more of your brains as I am stumped... 98 Mustang V6 Convertible. approx 130,000 miles Issue: MIL light is ON -Checked my codes: *P0174 System to Lean Bank 2 *H02S 2/1 Insufficient Switching Lean Mean *02S Ckt Slow Response 2/1 So I figured it was an issue...
  14. New To Mustangs! 1994 GT Help!

    5.0L Tech
    Hi everyone! I am a proud new owner of a 94 GT (AODE automatic :thumbdown) Mustang, as of 4 months ago, and as of today a new member to this forum. Anyway, this Mustang is the first Ford I've ever owned after 10 years of driving W-Body GM vehicles ('94 Lumina Z34, '97 Pontiac Prix GT, '00...
  15. poppin' crisp! help!!!! 2002 Mustang GT

    4.6L Tech
    i have a 2002 gt pretty much stock just exhaust and intake.......needin some help on this one. i have a popping noise coming from the motor while at idle and a shutter while maintaining speed at low rpm's. sounds to me like its running lean. any help?
  16. 1993 2.3L CEL OBD1 Codes and General Engine troubles

    2.3L Tech
    Ok, I have a 1993 2.3L Automatic Conv, and its got 232k (So I was told- Runs like a champ and doesn't burn a drop of oil). I was getting some intermittent Codes (186-172) a couple months ago and which verified it was running lean so I changed the fuel filter and a tensioner and pulley that...
  17. 1993 2.3L Engine trouble codes - Need Help

    2.3L Tech
    1993 Mustang 2.3L Automatic I had my check engine light come on a couple times and so I hooked up my Code Scanner, These are the codes I got: KOER (Running) 521- Power steering pressure switch (PSP) Circuit did not change states. 536- Brake On/Off (BOO) circuit failure/not activated during...
  18. Backfires! Magnaflow w/ H-pipe & cats... Running to Rich?

    4.6L Tech
    It does have cats and they look smaller than what I would have expected? It also has an H pipe not an X pipe. If its running rich or has weak spark what would be the most efficient way of dealing with that? I dont have a tuner or anything. Maybe plugs and wires? It does have 80,000 miles on it...
  19. Cold air intake with out a tune...will it lean out or damage your engine

    2005-2010 Mustang GT Tech
    Hi everyone, I am new to the forum and recently bought a 2009 Mustang gt. It is completely stock and I was looking at a K&N cold air intake as my first mod. This intake does not require a tune (and i don't want to have to tune) but I have heard many people saying that if you don't tune with a...
  20. 331 stroker lean on one bank

    5.0L Tech
    built a 331 stroker, has compucam 2040, bbk intake, 24# injectors,19lph pump, 70 mm throttle body heads with1.94" intake, 1.54"exhaust stainless swirl polished valves 180cc intake runners 58cc chambers, 1.6 rocker arms pedestal mount. fenderwell intake offroad h, flowmaster exhaust. have removed...