Guages Get Crazy Under Load
#1
Junior Member
Thread Starter
Join Date: May 2011
Location: Central Kentucky
Posts: 221
Total Cats: 1
Guages Get Crazy Under Load
Alright guys, I am getting tired of this issue and I'm stumped. I recently put together a turbo kit for my '90. Whenever I get above 50mph or so and give it gas or get into high load in 3rd, 4th, or 5th gear; my tach, oil pressure, and water temp gauges go all ***** nilly and it doesn't feel like it's pulling to it's full potential. 1st and 2nd gear gauges work just fine and pulls hard. I suspected a grounding problem but I cannot find the source and I'm getting flustered so I am asking for help.
Here is the issue on film. You should watch it one or so times for each gauge.
A little background info:
'90 stock motor 1.6
Tuned on a DIY Megasquirt 3X I built myself
Here are the known grounds that I was told to check.
The two behind the fuel rail
The engine head to firewall ground. I actually replaced this one so see if it made a difference. I also have an extra Megasquirt ground and my AEM wideband grounded here at the firewall as well.
I relocated the grounds under the brake boost to here.
I have checked the PPF ground and it is fine and intact. I am out of ideas.
Here is my build thread for those interested
Here is my Megasquirt build thread for those interested
Here is the issue on film. You should watch it one or so times for each gauge.
A little background info:
'90 stock motor 1.6
Tuned on a DIY Megasquirt 3X I built myself
Here are the known grounds that I was told to check.
The two behind the fuel rail
The engine head to firewall ground. I actually replaced this one so see if it made a difference. I also have an extra Megasquirt ground and my AEM wideband grounded here at the firewall as well.
I relocated the grounds under the brake boost to here.
I have checked the PPF ground and it is fine and intact. I am out of ideas.
Here is my build thread for those interested
Here is my Megasquirt build thread for those interested
#2
Can you take a wire wheel or sandpaper to each of those locations (both on the connector and on the chassis)? They look pretty dirty/corroded.
Also, check the clamps/connections on the battery itself. Sometimes they can get corrosion or work their way loose. Take some baking soda + water to clean it up, then sand paper/wire clean it as well.
Also, check the clamps/connections on the battery itself. Sometimes they can get corrosion or work their way loose. Take some baking soda + water to clean it up, then sand paper/wire clean it as well.
#4
How are your motor mounts?
I remember reading about a guys motor moving on the mounts and causing MS resets.. Long shot.
It couldnt hurt to add a temp ground to help in the diag. Run a wire from the battery to engine. 10ga or bigger. Just run it through the car and through the firewall if its easy or just around the door. Just to see if it helps at the different locations. A clean ground is a happy ground fo sho.
I remember reading about a guys motor moving on the mounts and causing MS resets.. Long shot.
It couldnt hurt to add a temp ground to help in the diag. Run a wire from the battery to engine. 10ga or bigger. Just run it through the car and through the firewall if its easy or just around the door. Just to see if it helps at the different locations. A clean ground is a happy ground fo sho.
#5
Junior Member
Thread Starter
Join Date: May 2011
Location: Central Kentucky
Posts: 221
Total Cats: 1
How are your motor mounts?
I remember reading about a guys motor moving on the mounts and causing MS resets.. Long shot.
It couldnt hurt to add a temp ground to help in the diag. Run a wire from the battery to engine. 10ga or bigger. Just run it through the car and through the firewall if its easy or just around the door. Just to see if it helps at the different locations. A clean ground is a happy ground fo sho.
I remember reading about a guys motor moving on the mounts and causing MS resets.. Long shot.
It couldnt hurt to add a temp ground to help in the diag. Run a wire from the battery to engine. 10ga or bigger. Just run it through the car and through the firewall if its easy or just around the door. Just to see if it helps at the different locations. A clean ground is a happy ground fo sho.
#6
Junior Member
Thread Starter
Join Date: May 2011
Location: Central Kentucky
Posts: 221
Total Cats: 1
I took your advice and gave the few engines grounds a good baking soda/water paste bath and wire brush scrubbing. Do these grounds at the battery look like they need some work?
And here is my ground up under the footwell that Bill mentioned. It seemed to be tightened by Zues and I couldn't get it off, but it looks secure, a little rusty though.
I plan on adding a 10gauge wire from the battery to the motor to see if that does anything. But I have to wait until I get my cold start/WUE settings right before I can do much. Having trouble starting and already fouled out plugs.
And here is my ground up under the footwell that Bill mentioned. It seemed to be tightened by Zues and I couldn't get it off, but it looks secure, a little rusty though.
I plan on adding a 10gauge wire from the battery to the motor to see if that does anything. But I have to wait until I get my cold start/WUE settings right before I can do much. Having trouble starting and already fouled out plugs.
Thread
Thread Starter
Forum
Replies
Last Post
SuperSneakySecretSquirrel
Meet and Greet
5
09-06-2015 08:30 PM
Motorsport-Electronics
ECUs and Tuning
0
09-05-2015 08:02 AM