I have heard people say that think they are the most reliable engine GM has ever made. I don’t know that I agree, but they belong in the conversation. This one has 250k miles and runs like a top other than a noisy supercharger bearing. $80 fix.
The Vacuum line that runs off the T under the SC snout back to the MAP was a major headache for me for a time. Damn thing blew off the MAP(I assume under boost) and I didn't see it since it's hidden back by the firewall. The factory rubber boot was just to loose to hang on the nipple on the MAP anymore. Ended up doing what you did here. Replaced it all with high temp silicon tubing and some Brass T's. Even put a little hose clamp on the MAP connection for extra piece of mind.
I put a few miles on the car before I sold it and never had another boost issue with it. If I were looking to make it perfect I would have for sure added some hose clamps too.
If you get a P0121 code for the TPS. Also check the vac lines! I kept getting that code even know the TPS sensor was good and I check all the wiring. The MAP sensor had a small tear in the rubber boot going to it causing that code which would also cause the transmission to not shift right.
@@CatfishMotorsports Has a after market ZZP PCM. So the tune on it may be why I got that code and not for the MAP. The MAP didn't agree with the TPS cause the vacuum was off. But the transmission relies on the TPS position for shifting.
By chance do you know what inside diameter of those hose between the supercharger bypass actuator and the vacuum tee up on top? Do you know what the middle leg of that tee is used for? mine has a screw capping it.
Good motors those 3800s, we got them over here in New Zealand in Holden commodores, pretty bullet proof for what they are
I have heard people say that think they are the most reliable engine GM has ever made. I don’t know that I agree, but they belong in the conversation.
This one has 250k miles and runs like a top other than a noisy supercharger bearing. $80 fix.
I have a 04 impala with the L67 great motor with cheap parts that are readily available I love it!
The Vacuum line that runs off the T under the SC snout back to the MAP was a major headache for me for a time. Damn thing blew off the MAP(I assume under boost) and I didn't see it since it's hidden back by the firewall. The factory rubber boot was just to loose to hang on the nipple on the MAP anymore. Ended up doing what you did here. Replaced it all with high temp silicon tubing and some Brass T's. Even put a little hose clamp on the MAP connection for extra piece of mind.
I put a few miles on the car before I sold it and never had another boost issue with it. If I were looking to make it perfect I would have for sure added some hose clamps too.
If you get a P0121 code for the TPS. Also check the vac lines! I kept getting that code even know the TPS sensor was good and I check all the wiring. The MAP sensor had a small tear in the rubber boot going to it causing that code which would also cause the transmission to not shift right.
That’s pretty wild that a tear in the MAP would mess with the trans.
Strange stuff happens. I just had my thermostat blow up into a worn housing.
@@CatfishMotorsports Has a after market ZZP PCM. So the tune on it may be why I got that code and not for the MAP. The MAP didn't agree with the TPS cause the vacuum was off. But the transmission relies on the TPS position for shifting.
Theres a calibration for that bypass valve. New one ships with a clip that locks it into the correct position
By chance do you know what inside diameter of those hose between the supercharger bypass actuator and the vacuum tee up on top? Do you know what the middle leg of that tee is used for? mine has a screw capping it.
Off the top of my head no, but I’ll go take a look at it tomorrow and see what I can see
@@CatfishMotorsports thanks. The thin wall stuff keeps kinking and collapsing