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98 Blazer losing power after driving for an hour


BLucchesi
02-23-2005, 05:17 PM
I'm having an issue with my 98 Blazer losing power after driving it continuously for over 45 min to an hour. Normally this happens on the highway. The truck seems to lose all power and the only way to keep up with traffic is to punch the accelerator and rev the engine up to around 4k which drops the gear down to 3rd. If I pull the truck over to the side of the road and let it sit for 10 minutes the problem goes away temperalily for about 20 minutes. Letting the truck sit overnight or for a period of longer than an hour or so seems to solve the issue and give me access to driving for the hour amount of time until the truck acts up again.

The check engine light comes on just before this lack of power occurs. The codes being spit out is P0151 sen B2 51 Low Volt and P0174 Bank 2 Too Lean. Also, P0101 MAF/VAF CKT Range/ Perf. Problem has occured once. Just before the truck loses power all O2 sensors read 0 Voltage for output

I am wondering if this has anything to do with a faulty MAF sensor messing around with the fuel/air mixture and thus tripping the O2 sensors?

So far this seems to be a new problem to everyone I've talked to....

sykopenguin
02-23-2005, 07:34 PM
I had this same problem with my 1990 blazer..it ended up being a bad pick up coil....i replaced it and truck ran perfect.

blazee
02-23-2005, 07:45 PM
I had this same problem with my 1990 blazer..it ended up being a bad pick up coil....i replaced it and truck ran perfect.

How is his problem like yours? Did you have a P0151-HO2S Circuit Low Voltage Bank 2 Sensor 1 trouble code? A P0174-Fuel Trim System Lean Bank 2 trouble code? Or a P0101-Mass Air Flow System Performance trouble code?

BlazerLT
02-23-2005, 08:03 PM
Clean your MAF sensor and reinstall.

When the MAF gets gunked up, it will throw everything out of whack.

Clean the sensor filament wires inside GENTLY and reinstall and clear your computer.

sykopenguin
02-23-2005, 08:18 PM
geesh im sorry blazee i was just saying how i fixed the same problem on my truck....good job making me feel like an idiot...was just trying to help *sigh* im sorry

blazee
02-23-2005, 08:29 PM
I wasn't trying to make you feel like an idiot. Don't feel bad, helping is what everyone is here for. I was just making it clear that you didn't know if you had the same problem, you only knew you had similar symptoms and nothing should be replaced without proper testing. Your advice shouldn't be disregarded, but it shouldn't be taken as the best solution for his problem either.

BLucchesi
02-24-2005, 08:14 AM
Thanks everyone for your help. I'll try cleaning out the MAF tonight after work LT. Appreciate all the info.

JoshBarber
02-24-2005, 02:07 PM
let us know!

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