misfire diagnosis and repair

[omegalita]

As for the codes, I was told that until the check engine or service engine light comes on, the codes have not been recorded and cant be read....Is this correct? That was one of my frustrations-putting up with the rough running until the engine actually threw a code.

Mine had this problem also... No codes were in...
Therefore i changed all the plugs and coils and the problem was solved...

Yeah. It's frustrating when there is a problem an you can't localize..

 

[toms89]

Hey Tom, Thanks for the info. I just had the chance to watch the you tube video of your Exp.- that was awesome. I'm the original owner of my 2000. I bought it at the end of 2000,when I was working as a pilot in the aviation business, and life was good. Well after 9/11 things got tough for a while and I left aviation to start my own general contracting business. I swore that I would never get rid of that vehicle for the sentimental reasons of it being with me through the tough times. My thought is that I'd like to keep it looking fairly "stock" but do some really cool things with the engine/suspension. My problem is that I dont know what options I have- do i want to work with the original block and make mods from there? Do I buy a block? Do I keep the air suspension and make mods to it (I know about the nightmares that people have had with it, but mine has served me well)?

Being new to the site, finding past articles, "stickys", etc.. is a little challenging. Can you point me in the right direction? Any advice in general is appreciated.

It all depends on where you want to go with it and do you have another vehicle. If you want to build the motor and can afford the down time you can work with your existing motor. If you cannot afford the downtime I would recommend building a 2nd motor that you can swap into the expy when ready. I took the 2nd route.

How you build the motor all depends on your goals. These modular blocks are very strong and can handle a lot of hp. The weakest link is the stock powdered metal rods and they are generally good for 450+ hp. If you are looking to increase your hp and stay n.a. I would focus and use most of your budget on headwork. They are the single biggest factor in the hp you will make. You are somewhat limited on hp you can make n.a. because with a heavy truck you cannot afford to lose low end torque and to significantly increase hp generally requires an increase in rpm and/or displacement. If you chose to do high rpm n.a. motor it would require a gear swap, looser converter, and significant change in the programming as far as tranny shift points and logic.

I would be glad to make recommendations based on your goals.

As far as suspension I am not the guy to ask. There are many lifted expy members here that would point you in the right direction.

 

[MUSKYMAN52]

I had bad gas and after 2 fill ups all the bad gas was gone and my engine stopped misfiring