DIY Repairs & Testing - LB9/L98 Tuned Port Injection (TPI) Engines Part 1/2
ฝัง
- เผยแพร่เมื่อ 27 เม.ย. 2020
- In today's video, we go over a few things in my new 1991 Pontiac Firebird Formula/WS6! This is part one, of a two part video series that will get this 305 TPI in GREAT running shape! Things we test/fix are as follow:
-Idle Air Control Replacement/Relearn
-Throttle Position Sensor (TPS) Testing
-Minimum Air Adjustment/Idle Adjustment
-Base Timing Adjustment
-ECU Reset/Seafoam Engine Treatment
-Throttle Body/IAC Cleaning
Part two will be uploaded ASAP!
Make sure you check out buying the car here!
• I bought a CHEAP F-Bod...
#ws6 #Formula #pontiac #thirdgen #tpi #tpiengine #tunedportinjection #projectcar #diy #carrepair
This is part one, of a two part series to keep videos relatively short! There's a LOT of information in this one, soon to be followed up with fixing the TPI engines idle/hesitation issues. Stay tuned!
I started having this issue last year. I pulled and rebuilt the LB9 of my '88 IROC about 5years ago. All new hoses, sensors, and IAC. My RPMs increase when I depress the clutch to shift gears and the idle is often high (1100ish) when sitting at a light in neutral (shif up light comes on!). A quick tap of the gas gets it back to 750rpm. I set the IAC voltage down to about 0.47VDC and adjusted the idle screw all to no avail. Reset ECU. Cannot find any idication of a vacuum leak. I may just bite the bullet and get a new IAC again.
The last time I had this problem with a car it was a clogged catalytic converter. After changing it, it ran like a new car. Drove me insane before I was able to find the problem.
A Vacuum hose connector that is a Y fitting was cracked. The hoses split one going to the throttle sensor. I had changed out the sensor with a new one. That was also cracked. Had the engine smoke checked which showed both issues. I know you can use fluids to check, but that worked better in my opinion. I had changed out the intake manifold gaskets and RTV due to an oil leak out the back side. Doable but not a one-day job. Changed out the EGR with a new Delco EGR. It wouldn't hold Vac. PSI. After 3EGR's I found one that held PSI. New parts aren't worth poop now a days. The other thing I learn was those Vacuum hoses may look good. But unless you check each and every line. You could be throwing parts at a leak. Hey at 30+ years rubber breaks down. Sorry to wine about my journey with an L98. Hope you get that nailed down. CHEERS
The IAC relearn you have to jump the A & B terminals in the OBD1 (ALDL) Then turn the key for it to open. You should heard it clicking rapidly. If you do this without jumping the terminals the IAC won't actually open... Remove the A/B connection, plug the IAC back in and then start the car.
I had 2 LB9's ... i beat the hell outta them .... it was an animal..... they need a nice modern 5.3
Mister hand likes giving a solo performance??
The car sometimes dying of during the first few miles after an ECM reset is normal. At least on the 3.1 V6 with the same ECM. But of course not the idling of your car.
Bad ass! Guys that can't fix carbs n tune neither can't fix tbi n tune cars.
Everytime I've had this idle problem (I've owned three TPI cars) it was always the IAC and or throttle position sensors.
This is a super helpful video! I have been looking for a video with exactly this content for a long time. Your filming and presentation are superior. I have an L98 on a ZZ4 in a 1975 Toyota Land Cruiser and have issues with idle and cold start. Your diagnostics and testing procedures are exactly what I needed to see. Thanks!
I haven’t watched part two yet but I’m very pleased with everything I have watched so far! Keep up the good work man. Hell buy a beater and make how to videos on the regular!!!!
Another awesome video!
the spark advance is what was wrong with mine. ty so much for putting this vid together
Love the Menards gloves! Got some just like it. 😊
Excellent video. Thanks
Good Video 👍
The corvet has same issues ...they changed the fuel pressure thing on the fuel rail..made big change...no more die outs
Way to have patience brother!!! Chasing down problems like that could drive you insane. Sounds like you're hot on it's trail!!!!!! I am enjoying nthe ride, and rooting for you to fix it!
Have you had any check engine codes with these problems. My iroc has always ran really well but also is prone to high idle and has had vacuum leaks over the years. My issues have translated to code 36 more than once. It’s like reoccurring issue for me.