tommyturbo
SHO Member
When I bought the car last summer, it ran perfect for about 2 months. I believe it had been stored for a while. Then the check engine light started coming on, and when i pulled the codes I got 19, 30something and 91. The 30 something was about egr and hasn't come back since.
I replaced both 02's and still got both 19 and 91. My mechanic checked fuel pressure and determined the fuel pressure regulator to be bad, pump works fine, and replaced the fuel pressure regulator. No more 91, but 19 set every single time the car is driven.
Had car checked out by shop recommended by a member here, and they fixed one spot in the wiring that had been damged on the back side of the engine, replaced cam and crank sensors and ran tons of diagnostics, and found no problems. But the light still always comes on. Usually durning rpm changes, like shifting or lifting off throttle. Tried swapping computer, no change same fault. Sent it to an auto electric shop they recommended, nothing wrong could be found, told me it was some quirk and he couldn't find anything wrong.
I drove it this way for a month and then it started it run really bad, dropping cylinders etc. New plugs and wires curred that, but same code 19.
Finally spent the $ and got a new dis and coil pack, despite being told both were ok by previous shops. The first time driving the car recently after new dis and coil pack I get light, check codes, 49 and 91 and 19. I look up the code, something about the spout and defaulting to 10 degrees timing, and the lean condition in front bank I think...and of course the cid circuit. Haven't touched the car since.
Car runs great, strong, and feels quicker than my 95. But the damn check engine light is always coming on with cid circuit faults. I should think the 02's would last longer than this too. Could be a fluke it ran lean. Occasionally it would stumble for a few seconds like it was looking for timing when it was cold outside, but the weather is warm and haven't noticed that for a while.
Now car is running bad, bucking and acting like it is starved for fuel. Tried replacing the ccrm thinking this may be the issue as it might have been disrupting the fuel pump and power to computer.
No change, same bucking and codes. Dropped it off at my mechanic again, and now the car is making up a code 30 on top of the 19 and 91, which I am told there is no code 30 and when looking up the codes online I see no 30.
The computer has been swapped as a test as well, with a computer from another 89 with same logic code.
Does anyone have any ideas?
I replaced both 02's and still got both 19 and 91. My mechanic checked fuel pressure and determined the fuel pressure regulator to be bad, pump works fine, and replaced the fuel pressure regulator. No more 91, but 19 set every single time the car is driven.
Had car checked out by shop recommended by a member here, and they fixed one spot in the wiring that had been damged on the back side of the engine, replaced cam and crank sensors and ran tons of diagnostics, and found no problems. But the light still always comes on. Usually durning rpm changes, like shifting or lifting off throttle. Tried swapping computer, no change same fault. Sent it to an auto electric shop they recommended, nothing wrong could be found, told me it was some quirk and he couldn't find anything wrong.
I drove it this way for a month and then it started it run really bad, dropping cylinders etc. New plugs and wires curred that, but same code 19.
Finally spent the $ and got a new dis and coil pack, despite being told both were ok by previous shops. The first time driving the car recently after new dis and coil pack I get light, check codes, 49 and 91 and 19. I look up the code, something about the spout and defaulting to 10 degrees timing, and the lean condition in front bank I think...and of course the cid circuit. Haven't touched the car since.
Car runs great, strong, and feels quicker than my 95. But the damn check engine light is always coming on with cid circuit faults. I should think the 02's would last longer than this too. Could be a fluke it ran lean. Occasionally it would stumble for a few seconds like it was looking for timing when it was cold outside, but the weather is warm and haven't noticed that for a while.
Now car is running bad, bucking and acting like it is starved for fuel. Tried replacing the ccrm thinking this may be the issue as it might have been disrupting the fuel pump and power to computer.
No change, same bucking and codes. Dropped it off at my mechanic again, and now the car is making up a code 30 on top of the 19 and 91, which I am told there is no code 30 and when looking up the codes online I see no 30.
The computer has been swapped as a test as well, with a computer from another 89 with same logic code.
Does anyone have any ideas?
