Something Isn't Right still....
Owned the car for 3 months (88' GT 5spd), did necessary maintenance to replace all the original things inside and outside of the engine bay to get the car roadworthy and reliable. I also added a BBK 70mm TB (now regretting) and original 93' Cobra intakes among other things.
It would seem ever since the intake install, I've been getting a backfire through the TB. It seems to "load up" under 2,000 rpms and it doesn't matter what gear it's in. Appears to feel sluggish many times when shifting from 1-2-3 gears when you depress the clutch, shift and accelerate. The engine is still very responsive and strong however once I get passed about 1,700 rpms. I also can't for the life of me get the car to idle under 1,000 rpms, which leads me to my main question. No coolant in my oil or out my pipes and no bent valves.
Could I have routed the vacuum lines incorrectly from the standard 5.0 H.O setup, when I installed the Cobra intakes? I have tried looking up a solid vacuum routing conversation but not really seeing much.
I noticed my brand new TPS sensor that came with the BBK TB is most likely bad as when I test it with a meter and a full sweep of the throttle blade--there's a point when the reading goes haywire and then smooths back out. That's certainly not correct.
Here's what I've done to update the car:
ALL ignition (including distributor)
Most all vacuum hose
All unused vacuum ports are capped
Cleaned salt and pepper shakers
Base idle reset didn't even get me to idle under 1,000 rpms
*13 advance on the timing
What's still 26 years old:
You have all been very great to me since I've recently joined; so any help is very appreciated.
88' Mustang GT 5spd |
06' Grand Marquis
"Maintenance before Performance"