1995 Chevy Suburban Engine problem

Tiny
STAGRE22
  • MEMBER
  • 1995 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
I have a 95 or 96 motor home with a 454 engine. It has 50000 miles on the engine. It woulld not start, and was found to have a defective fuel pump. Replaced fuel pump engine started and ran fine. Drove for 25 - 30 miles without a proplem then will pullling a hill I opened the throttle fully and the motor backfired and lost all power. Engine would idle without a problem but when throttle was incresed the engine did not have enough power to pull itself. After a few minutes the problem went away and started running correctly. Again when I opended the throttle fully the problem re-occured. Took to the dealer they replaced the distrubutor, egnition module, rotor, cap. Did not fix the problem and they blamed the problem on bad gas.
I am getting bad heated oxygen senson on two sensors and it also says somthing about the crank sensor. I no longer have to fully open the throttle to cause the problem it will happen within the first 10 t0 20 miles. If I reset the error code the problem will go away until the check engine light comes on. Resetting the error will again fix the problem until the check engine light comes on. Does this sound like a crank sensor porblem? I am tired of throwing parts in an attempt to fix.

Thank you
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Sunday, August 9th, 2009 AT 8:46 AM

5 Replies

Tiny
BMRFIXIT
  • EXPERT
As I 1st start reading I was thinking maybe bad gas
and I will still check fuel tank and fuel in it
but if you can provide the code that would be much better to determine the cause

check crank pulley and crank sensor wiring and if secure on
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Sunday, August 9th, 2009 AT 7:52 PM
Tiny
STAGRE22
  • MEMBER
The motor home has a 100 gallon tank and I added 50 gallons of 93 octane gas thinking it may be a bad gas problem. I also added several bottles fo stabil to the tank.
The error codes I'm getting are a P0131 & P0151. It also notes a crank sensor. But does not give an actual crank sensor code.
If the gas was bad would it not be a problem all the time? And I would not think it would be possible to reset the error code and the engine starts to run properly again (only for a short time).
It may be worth my while to pump all the gas out of the tank and add new.

Thanks for your help, this problem is driving me crazy!
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Monday, August 10th, 2009 AT 7:24 AM
Tiny
BMRFIXIT
  • EXPERT
Not very familiar with a motor home system
but lets try and solve this one

if you like take a fuel sample and test it
100 gallon is a lot of fluid and money to dump

p0131 and p0151

check fuses and wiring between O2 sensors and VCM
codes indicating system running lean
check fuel pressure
also let do and try this if you have a MAF sensor disconnect it and start and give it a drive
let me know
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Monday, August 10th, 2009 AT 7:19 PM
Tiny
STAGRE22
  • MEMBER
I'm going to be out of town for a week when I get back on Aug. 22 I will check out the mass flow sensor. Where do I go to have a fuel sample tested?

Again thanks for your help!
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Tuesday, August 11th, 2009 AT 7:14 AM
Tiny
BMRFIXIT
  • EXPERT
Have fun and a safe trip

we use Kolor Kut Modified Water Finding Paste

3.0 oz. Tube

Kolor Kut Modified Water Finding Paste has been designed for use in methanol, ethanol enriched fuels in all proportions when they are water-free but relatively small amounts of water can cause separation of alcohol from the fuel. The mixture settling to the bottom of the storage tank is predominately alcohol by most water detection pastes. Kolor Kut Modified changes from dark brown to bright red on contact with water. Phase separated alcohol solutions with as little as 6% water will turn the paste yellow.
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Tuesday, August 11th, 2009 AT 6:36 PM

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