Another 2000 Blazer Fuel Pump

[bhesson]

No check engine light. So my 2000 Blazer has no CPI and no nut kit I've seen mentioned in other threads? Sorry if I misread the posts.

[BlazerLT]

Nope, only 1992-1995 have the CPI and nut kit.

What platinum plugs did you use, AC Delco or some other brand?

Have you installed a K&N filter lately?

You might want to clean your MAF sensor and reinstall. Just spray brake cleaner through the inner portion of it to clean off the junk off the sensor wires inside.

[bhesson]

Thanks for the reply, I appreciate it. I do have a K&N filter but I last oiled it in the summer and I used the exact replacement AC/Delco platinums.

Anyway, the Service Engine light came on today 5 minutes after filling up with Sunoco 87 octane. I've had the light come on in the past two times after a fill up about a year ago and it went off shortly after that. Hopefully it will return a useful code to point to what's happening and not be related to the fill up. I'll have the codes read hopefully tomorrow, if not, I just purchased a OBD-II scanner which should arrive next Tuesday. I'll let you know what I find.

Also, I'm going to replace the fuel filter for the heck of it since the tank was dropped and moved around when the pump was replaced. I'm thinking dirt in the bottom of the tank could have been disturbed. It's a long shot but the filters cheap enough and it can't hurt to try it.

At this point, my best guess is it's starving for gas under light acceleration when it bogs down versus too much gas since if I press harder on the pedal it stops bogging down and moves forward fine. I would think if it was getting too much gas, it would get worse if I pressed harder on the pedal at that point. It also doesn't do it consistently. Today for instance it did it once and hasn't done it since. The day before it happened about 3 times and was as worse as it's been when I was on an uphill incline and tried to start from a dead stop with a light pedal.

I'll also clean the MAF like you suggested. Just to be sure, the MAF is in the intake hose between the filter hose and the hose leading to the throttle body. It has the screen in it with a small wire in the middle, is that correct?

[BlazerLT]

Did you overfill the tank?

Remember to only fill until it clicks off and then top off to the next dollar.

[bhesson]

Yea I'm pretty sure that's what caused it. It didn't overflow but I was trying to top it off so I could get a good reading on the current MPG I'm getting since the repairs and current problem started. Thanks for your reply, I appreciate your help ...

[bhesson]

Hi, I bought this OBD II reader and should have it by Tuesday.

Any comments on it? Is it a good reader? I didn't want to lay out hundreds of dollars for something I'd use very little but I also wanted to try and get a decent reader. I hope I made a good choice.

Thanks for any comments ...

http://www.autobarn.net/eqobdiicodre.html

[bhesson]

The code came back as a PO174 ...

It indicates cleaning the MAF sensor and replacing the fuel filter which I will do this weekend.

Just to be sure, the MAF sensor is in the intake hose, between the throttle body and the filter housing ... It's the window screen like unit with a wire running into it's center and cross hairs? Is that correct?

I just cleaned the MAF and to be honest, it didn't look dirty at all. I guess we'll see what happens.

BTW, love the ODB II reader, it seems to be quite nice for $100 ...

[bhesson]

Mystery solved, thanks for the responses.

Not sure why I didn't notice it earlier but the repair shop that replaced the fuel injector in cylinder 5 left the hose to the PCV valve disconnected from the intake housing.

I discovered it yesterday after cleaning the MAF and looking for vacuum leaks and haven't had a problem since ...

Now I'll be replacing the cruddy roof rack with a new one I found on EBay for $57 which included shipping and I'll be happy. I just hope the torx screws aren't as stubborn as I've heard they can be. For anyone interested, the company has plenty of the roof racks and I was surprised to find that it was BRAND NEW when I got it !!

http://cgi.ebay.com/ebaymotors/00-S-...QQcmdZViewItem

[bhesson]

Just replaced the roof rack and it was a breeze. The factory had coated the screws with thread ease and they came out clean. I worked on the GM assembly line in the 80's so I was surprised to see they've gotten more user friendly since then. Back in the 80's we just used an air gun and drilled the crap together without any thread ease.

Anyway, I'm a happy camper, it's running great and starting on the first try since the fuel pump was replaced and I actually know how much fuel I have in the tank now !

Life's great !!!