I’m new here and I have some questions.

[Rawze]

(01-13-2020 )cowboycurtis Wrote:  I bought a 2007 Peterbilt with an ISX450 and 990,000 miles about a year ago. It has the EGR removed. The check engine light is always on. Also the manifold pressure gauge on the dash runs at about 22psi for max pressure. What does a typical ISX450 run for manifold pressure?

This truck seems to be a little short on power. I have 2 2003 Freightliners with 12.7 Detroit’s that will walk away from the Peterbilt.

What should I be looking for and what are my options?

If the egr was removed and someone put in a program for that .. then its 99% most likely a bad program.. you chances of someone having doen it rught are very very slim..

It is a CM870 engine, so it is also possible someone just unplugged the egr valve and let it derate (boost derate)... some people drove them around like that, but it is really hard on the turbo and EGT's go through the roof, shortening the life of the turbo by 1/3.

- Either case, if it is to be run without the egr on it, it will need re-programming for it to operate correctly.