1991 VVT Swap Woes
10-11-2022, 10:39 PM
#1
Newb
Thread Starter
Join Date: May 2022
Posts: 25
Total Cats: -4
1991 VVT Swap Woes
Hi everyone,
I've finally finished my VVT swap and I got my car to start, but I'm running into a couple of issues that I can't explain. The only things that aren't stock about this motor are the upgraded Volvo valve springs, I'm using the 1.6 oil pressure sender, and I've swapped in a VICS manifold.
When I blip the throttle, as you can see at the end of the video, it holds the higher rpm for way too long. I'm running an MS3 Basic and it sees that the throttle is blipped as well, but the rpm stays high past that. This is with the transmission in neutral, so no momentum to kill.
Another thing is that when I give it a bit of load, you can hear this nasty rattling sound that I can't track down. I think it's detonation, but I'm running 93 octane and I'm using a base ignition map for a VVT engine. I even dialed down the ignition advance significantly with no changes.
I've had issues with my AFR readings being weird before from my wideband, but I've since fixed them and my car was running a bit rich during this entire time since it was still warming up.
Any ideas on what's going on? Let me know if you guys need more info.
Here's the video: https://streamable.com/yam6ty
I've finally finished my VVT swap and I got my car to start, but I'm running into a couple of issues that I can't explain. The only things that aren't stock about this motor are the upgraded Volvo valve springs, I'm using the 1.6 oil pressure sender, and I've swapped in a VICS manifold.
When I blip the throttle, as you can see at the end of the video, it holds the higher rpm for way too long. I'm running an MS3 Basic and it sees that the throttle is blipped as well, but the rpm stays high past that. This is with the transmission in neutral, so no momentum to kill.
Another thing is that when I give it a bit of load, you can hear this nasty rattling sound that I can't track down. I think it's detonation, but I'm running 93 octane and I'm using a base ignition map for a VVT engine. I even dialed down the ignition advance significantly with no changes.
I've had issues with my AFR readings being weird before from my wideband, but I've since fixed them and my car was running a bit rich during this entire time since it was still warming up.
Any ideas on what's going on? Let me know if you guys need more info.
Here's the video: https://streamable.com/yam6ty
Reply
-1
-1
10-12-2022, 12:45 AM
#2
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,206
Total Cats: 1,139
I do find it interesting that it's seems louder when the camera is by the air filter, which happens as you walk up, and as you walk away. I would make sure your AIT hasn't fallen off inside the intake and into the engine, scope the cylinders, and cut the oil filter open and look for debris.
I should also note that OP is running at ~3 degrees timing due to ignition idle comp, still at ~1250rpm, and 0% idle duty. I suspect an intake leak, sorta hard to diag a high rpm hang with that going on.
I should also note that OP is running at ~3 degrees timing due to ignition idle comp, still at ~1250rpm, and 0% idle duty. I suspect an intake leak, sorta hard to diag a high rpm hang with that going on.
Reply
0
0
10-12-2022, 01:16 AM
#3
Newb
Thread Starter
Join Date: May 2022
Posts: 25
Total Cats: -4
I do find it interesting that it's seems louder when the camera is by the air filter, which happens as you walk up, and as you walk away. I would make sure your AIT hasn't fallen off inside the intake and into the engine, scope the cylinders, and cut the oil filter open and look for debris.
I should also note that OP is running at ~3 degrees timing due to ignition idle comp, still at ~1250rpm, and 0% idle duty. I suspect an intake leak, sorta hard to diag a high rpm hang with that going on.
I should also note that OP is running at ~3 degrees timing due to ignition idle comp, still at ~1250rpm, and 0% idle duty. I suspect an intake leak, sorta hard to diag a high rpm hang with that going on.
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
oreo
Build Threads
184
01-30-2024 03:25 PM
spencer9474
Cars for sale/trade
4
05-14-2018 08:49 PM
