Low rpm sputter
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
Rain makes it worse? You’ve got something…a wire or a sensor…with a crack or a tiny hole on it. I had a cracked plug wire once that drove me nuts…in the rain it would break up and sputter. The silicone draws moisture, and when it was raining the thing would sputter like crazy under load.
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
I get all my crank and cam sensors from the junkyard and make sure they have GM part numbers on them. I don't know why, but no aftermarket companies can make these things where they'll function correctly.
TECH Enthusiast
Joined: Jul 2019
Posts: 636
Likes: 187
check the connector where the coil pack harness plugs into the main harness. could be some corrosion or leak there on one side that causes a problem that is exacerbated by rain.
also check the coil pack grounds. the fact that it doesn't start is definitely notable, either its not seeing RPM or its not lighting off on a whole bunch of cylinders.
also check the coil pack grounds. the fact that it doesn't start is definitely notable, either its not seeing RPM or its not lighting off on a whole bunch of cylinders.
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Verdad Gallardo Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
You said you cleaned the injectors? How? I can almost guarantee you have a piece of debris holding an injector open. I clean mine by using a cheap amazon injector tester, sticking them in a bowl of Berryman's, and cycling the injector while pulling a vacuum on the top so the fluid flows backwards though the injector. If it's not an injector and your EVAP purge is still hooked up, I'd check the hose for fuel. If your canister somehow got saturated with fuel, that could cause this as well.
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
You said you cleaned the injectors? How? I can almost guarantee you have a piece of debris holding an injector open. I clean mine by using a cheap amazon injector tester, sticking them in a bowl of Berryman's, and cycling the injector while pulling a vacuum on the top so the fluid flows backwards though the injector. If it's not an injector and your EVAP purge is still hooked up, I'd check the hose for fuel. If your canister somehow got saturated with fuel, that could cause this as well.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
Well, if you pulled the intake and that valve had fuel on it, I'd suspect that injector was acting up. It may open, but it might stick on closing due to debris in the injector and it ends up adding too much fuel. That would explain the stumble, but not the fact that it's worse when it gets wet. If I were you, I'd swap injectors and see if the problem follows the injector or not. If it doesn't, I'd be digging into the wiring harness and looking for frayed wires.
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
Well, if you pulled the intake and that valve had fuel on it, I'd suspect that injector was acting up. It may open, but it might stick on closing due to debris in the injector and it ends up adding too much fuel. That would explain the stumble, but not the fact that it's worse when it gets wet. If I were you, I'd swap injectors and see if the problem follows the injector or not. If it doesn't, I'd be digging into the wiring harness and looking for frayed wires.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
I have found that with that injector tester, if the injector won't fire when you pulse it, grab a screwdriver and tap the body when you hit the pulse button and sometimes that will get them working. My original injectors sat for 15 years with no fuel in them and 3 out of 8 were stuck until I soaked them in Berryman's and tapped them with a screwdriver while pulsing.
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
I have found that with that injector tester, if the injector won't fire when you pulse it, grab a screwdriver and tap the body when you hit the pulse button and sometimes that will get them working. My original injectors sat for 15 years with no fuel in them and 3 out of 8 were stuck until I soaked them in Berryman's and tapped them with a screwdriver while pulsing.
Thread Starter
On The Tree
Joined: Nov 2021
Posts: 138
Likes: 15
So finally the car is running with no more sputter the new injectors fixed the problem. The no start problem so far is gone too. I’m gonna have to take it to my tuner though it’s throwing a rich code now unless someone can guide me through it on hp tuners I’ll do it myself. But finally some relief thing was driving me nuts!