Hi All!
Been lurking around the forum for a few days trying to nail down some information on codes my '99 Hoe is throwing.
First, a little background. It's a '99 Tahoe, 5.7 Vortec engine with just under 129,000 miles on it. It's been throwing the p0430 (catalyst system effciency below threshold) code for some time and I think I know what is causing that, but any suggestions welcomed.
Over this past weekend (Jan. 6-8) I replaced the fuel pump and now it's throwing these codes.
It's thrown the p0304 (cylinder 4 misfire) code before and I replaced the cam sensor and it went away, but it's back. It seems to trip if I am driving up a hill or when I get on the throttle to downshift or pass someone. Truck shakes like it's about to fall apart, I have no acceleration and the code comes up. I have replaced plug wires, plugs, cap and rotor. I've read in several places it could be the distributor gear and I do have that part, but I have no idea how to get the engine to TDC or BDC to change it out.
The p0101 (Mass Air Flow (MAF) Circuit Range/Performance Problem) is a recent one. I pulled the MAF sensor and cleaned it with MAF cleaner. I also replaced the air filter and it's still cropping up.
Also, it's been burning through gas like it's priced at $.50/gallon! 33 gallons twice a week at $3.50 starts to impact the wallet after awhile!
Now, my questions:
1. Could any of these codes be related to the new fuel pump?
2. Is there a way of getting the engine to TDC or BDC to change the distributor gear?
3. Are there any other possible causes for the misfire? I've even changed plug wires from one cylinder to another to see if the error would follow it and it didn't, still got the number 4 misfire.
Love the truck! The big guy's been with since he had 11 miles and we've been through hell and highwater, so I'd like to get him back healthy again.
If there are any tips, suggestions, advice, I'd surely appreciate them!
Been lurking around the forum for a few days trying to nail down some information on codes my '99 Hoe is throwing.
First, a little background. It's a '99 Tahoe, 5.7 Vortec engine with just under 129,000 miles on it. It's been throwing the p0430 (catalyst system effciency below threshold) code for some time and I think I know what is causing that, but any suggestions welcomed.
Over this past weekend (Jan. 6-8) I replaced the fuel pump and now it's throwing these codes.
It's thrown the p0304 (cylinder 4 misfire) code before and I replaced the cam sensor and it went away, but it's back. It seems to trip if I am driving up a hill or when I get on the throttle to downshift or pass someone. Truck shakes like it's about to fall apart, I have no acceleration and the code comes up. I have replaced plug wires, plugs, cap and rotor. I've read in several places it could be the distributor gear and I do have that part, but I have no idea how to get the engine to TDC or BDC to change it out.
The p0101 (Mass Air Flow (MAF) Circuit Range/Performance Problem) is a recent one. I pulled the MAF sensor and cleaned it with MAF cleaner. I also replaced the air filter and it's still cropping up.
Also, it's been burning through gas like it's priced at $.50/gallon! 33 gallons twice a week at $3.50 starts to impact the wallet after awhile!
Now, my questions:
1. Could any of these codes be related to the new fuel pump?
2. Is there a way of getting the engine to TDC or BDC to change the distributor gear?
3. Are there any other possible causes for the misfire? I've even changed plug wires from one cylinder to another to see if the error would follow it and it didn't, still got the number 4 misfire.
Love the truck! The big guy's been with since he had 11 miles and we've been through hell and highwater, so I'd like to get him back healthy again.
If there are any tips, suggestions, advice, I'd surely appreciate them!
