Hi, i got a 1991 mustang all rebuilt and when i installed a roll cage in it the car it is now slow. I think i may of damage a wire e we hen sliding ghe roll cage bar thru the dash. The car runs fine but it iis just slow. What could I have possibly disconnected to loose so much hp but that the car runs fine in a sense no hesitation no back fire no nothing just missing like 100 hp
Great thanks. That’s exactly how it feels like the cage weighing 1000 lbs (its only maybe 150 lbs). I will check the things you said. I had already check the codes but they seem to fit with what was done to the car. K on and E off code 85 the canester was removed. K on and E on code 94 and 44 the air pump removed and code 33 the EGR removed. I bought the car like that 10 years ago and it worked well mind you I never checked the codes until this day.@Regi
1. Check for dead bodies or other dead weight in the trunk.
2. Run codes and a cylinder balance test. (Fuel and ignition issues can pull a lot of power or all of it.)
3. Check that the throttle pedal is opening the flap in the TB (or carb) all the way.
4. Go for a timed test run to verify the butt dyno results.
Well when I took the stang out for the first time that was exactly my first impression. I got a 347 ci and it use the pull like crazy you could feel it. After the cage installed it now pulls less than stock, no dyno done but the difference is too obvious. The cage is 150 lbs. I installed the cage alone and have to admit that I slidedd the cage bar thru the dash and after realized that wires were going thru there (too anxious to get it done). The fuse box is only a few inches from the bar. I check the best that I could with the cage now blocking the hole and saw nothing damaged. The code: K on and E off code 85 the canester was removed. K on and E on code 94 and 44 the air pump removed and code 33 the EGR removed. I bought the car like that 10 years ago and it worked well, mind you I never pulled the codes up until this day.Codes?
You guessing (butt dyno) or ET or dyno numbers change?
Thanks no welding all bolted down. But I think the battery was connected when I put the cage in yes. ImDid you weld on the car with battery connected?
Ok i will do the check list. The fuel pressure stays at around 50 lbs when idling looking at the fuel line pressure gauge.So did you do the cylinder balance test? What about checking fuel pressure?
Here is the big diagnostic check list you need to do. And do in order.
Help me create the "Surging Idle Checklist"
Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...www.stangnet.com
The fuel PSI is checked with the vac line disconnected. I am sure that’s in the steps.Ok i will do the check list. The fuel pressure stays at around 50 lbs when idling looking at the fuel line pressure gauge.
For 450 hp, it should have bigger injectors, a matching MAF, and probably a tune with one of an assortment of add on gadgets.Ok i put it at 45 psi with disconnecting the vacuum line at the fuel regulator. It is now at 40 with the vacuum connected. The engine, i was told makes 450 hp so I thought it need fuel. I am checking the TB plate now. I noticed that it stays at about 3/4 open at full throttle (pedal to the floor). Is 3/4 normal see picture or I need to make sure it opens all the way?? See photo
That was one of my first suggestions. I hope it helps.Ya it does. All 24 lbs injectors and MAF. My issue only dates a few months now where I only added a rollcage. Before that all good. But in one of the chat someone said to check if the throttle body opened the entire way and now I see that it doesn’t. So i will try to get that TB plate to open completely. Thanks gor the chat. This is a nice place to communicate.
Check the wires and the connector where the passenger kick panel should be.I will try to get the TB plate/door to open the all way when pressing the gas pedal the entire way. Trying to read how to do this don’t see any adjustments on the TB or cable so must be at the gas pedal (so removing the seat and all won’t do that today).
Here is some pictures
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