Fuel problem
Thread Starter
Teching In
Joined: Feb 2020
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Fuel problem Afternoon,
I have a 98 trans am. It was my daily driver until about 12 years ago. Car was running fine and parked under a shelter. Several years ago I went to crank it and it would not start. I never went into full diagnostics with it. I’ve recently decided to redo the car from front to back, but before I got to involved wanted to diagnose the original problem. With a fresh brand new battery the car will turn over just fine, but no ignition. Fuel system has been bypassed up to the injector rails. I am getting fire to the injectors and pressure to the rails. The best I’ve been able to get is the car to crank for is about 2 seconds. Any suggestions on where to start?
I have a 98 trans am. It was my daily driver until about 12 years ago. Car was running fine and parked under a shelter. Several years ago I went to crank it and it would not start. I never went into full diagnostics with it. I’ve recently decided to redo the car from front to back, but before I got to involved wanted to diagnose the original problem. With a fresh brand new battery the car will turn over just fine, but no ignition. Fuel system has been bypassed up to the injector rails. I am getting fire to the injectors and pressure to the rails. The best I’ve been able to get is the car to crank for is about 2 seconds. Any suggestions on where to start?
Joined: Nov 2001
Posts: 34,564
Likes: 2,472
From: Schiller Park, IL Member: #317
And what do you mean by the fuel system being "bypassed"? If you're getting pressure at the rails and the injectors have power, what makes you certain that it's a fuel problem? Or am I somehow misunderstanding your post?
Thread Starter
Teching In
Joined: Feb 2020
Posts: 4
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So what happens after those two seconds? Does the cranking just stop?
And what do you mean by the fuel system being "bypassed"? If you're getting pressure at the rails and the injectors have power, what makes you certain that it's a fuel problem? Or am I somehow misunderstanding your post?
And what do you mean by the fuel system being "bypassed"? If you're getting pressure at the rails and the injectors have power, what makes you certain that it's a fuel problem? Or am I somehow misunderstanding your post?
Joined: Apr 2006
Posts: 3,813
Likes: 1,095
From: Grand Rapids, Michigan
You're going to be chasing your tail if you don't hook up a mechanical fuel pressure gauge to the rail and verify that pressure is staying steady ( or not ) when the car is running and shuts off. If the pump shuts off, verify that the PCM is continuing to trigger the pump to stay on. If it's not, then the PCM is not seeing the crankshaft position signal that tells it the engine is running. If the sensor is bad, do not get a parts store sensor. Just go get a used GM sensor from the junkyard. They are the only ones worthwhile. This is not the only issue you could be having, it's just one to look at.
