dirtautoguy
I'm Awesome
- Joined
- Jul 22, 2015
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Some may have read my post a few years ago about my dads truck it’s a 1997 k2500 with 454 vortec 167000 miles. In summery it would randomly get a lean bank 2 code. And run really rough it was not consistent enough to track down so we left it alone. Before we tore it apart my dad had a mechanic take a quick (free) look at it and told him cylinder 5 was missfiring but other then that it wall looked good.
Finally it started running really terrible consistently. Still with no codes. We pulled the upper intake off and found that 4/8 injectors were leaking….. we also found the vacuum line from the pressure regulator was kinked and cracked. If I plugged one end and blew into the other it wouldn’t hold pressure and it smelled like gas. I also found one plug wire that had a bit of rust and corrosion in it on plug 6
So we fired the parts cannon at it with 8 new Delphi injectors, new cap+rotor, fuel pressure regulator, vacuum hose, and intake gaskets.
When we fired it up the first time
It ran smoother than it ever has since he has owned it. And it certainly does drive 100x better. However now it does feel as though it has a misfire. There are no codes and my scanner won’t tell me what cylinder is missing. Even so it drives a lot better but still has an obvious issue.
It idles down to 650rpm and doesn’t appear to have any kind of vacuum leak. Fuel trims are much better. It used to be in the -4 percent and 18 percent. Now it stays pretty close to 0 and stayed within 2-3 percent of each other on long term.
The other issue that has come up after putting it together is the radio keeps cutting in and out. Sometimes with sound sometimes no sound and sometimes the theftlock light stays solid sometimes it flashes. No matter what I did though the truck will always restart so it doesn’t seem to be a true theft lock issue. The radio has been doing weird things for quite some time now anyway.
For fun I did a voltage test and found that between battery negative and body ground there was a .08vlt And .01 from battery neg to the block.
Before he goes home tonight I’m going to take a big wire and just hook it from the battery to the body and see if something changes. It couldn’t hurt?
I’m leaning towards replacing the plug wires and maybe plugs but he doesn’t want to spend more money than he has to.
Thoughts? Things to check/ try
Finally it started running really terrible consistently. Still with no codes. We pulled the upper intake off and found that 4/8 injectors were leaking….. we also found the vacuum line from the pressure regulator was kinked and cracked. If I plugged one end and blew into the other it wouldn’t hold pressure and it smelled like gas. I also found one plug wire that had a bit of rust and corrosion in it on plug 6
So we fired the parts cannon at it with 8 new Delphi injectors, new cap+rotor, fuel pressure regulator, vacuum hose, and intake gaskets.
When we fired it up the first time
It ran smoother than it ever has since he has owned it. And it certainly does drive 100x better. However now it does feel as though it has a misfire. There are no codes and my scanner won’t tell me what cylinder is missing. Even so it drives a lot better but still has an obvious issue.
It idles down to 650rpm and doesn’t appear to have any kind of vacuum leak. Fuel trims are much better. It used to be in the -4 percent and 18 percent. Now it stays pretty close to 0 and stayed within 2-3 percent of each other on long term.
The other issue that has come up after putting it together is the radio keeps cutting in and out. Sometimes with sound sometimes no sound and sometimes the theftlock light stays solid sometimes it flashes. No matter what I did though the truck will always restart so it doesn’t seem to be a true theft lock issue. The radio has been doing weird things for quite some time now anyway.
For fun I did a voltage test and found that between battery negative and body ground there was a .08vlt And .01 from battery neg to the block.
Before he goes home tonight I’m going to take a big wire and just hook it from the battery to the body and see if something changes. It couldn’t hurt?
I’m leaning towards replacing the plug wires and maybe plugs but he doesn’t want to spend more money than he has to.
Thoughts? Things to check/ try