O2 sensors and egr valve

10

Asked by mhunike Feb 28, 2011 at 01:51 PM about the 1988 Chevrolet Beretta

Question type: Maintenance & Repair

I have a 88 base beretta I am having bad gas mileage.  I have a 2.0 4 cylinder.  Wanted to know if the ecm should pick up o2 sensor if unhooked.  My ecm is picking up trottle control and map sensor but not o2.  Should ecm pick it up or do you have to drive car to get message.  I also  think my egr is not working correctly.  The  repair book said that the engine will stall if you push in the egr diaphram while running mine doesn't.

4 Answers

325

If the engine doesn't stall when the EGR diaphram is opened, the intake is either coked up so the EGR passages are blocked, or the computer has learned a much higher IAC (idle air control) count, and has adapted to run with a leaking EGR valve (unlikely, but possible). If the O2 sensor is unhooked--the computer won't respond to O2 sensor data.

2,855

Would first try basic mantienace items first. Plugs, wires things of that nature. It is possible buildup of carbon from years neglect. Wouldnt be wise to unplug o2 sensor becaues thats what makes fuel calculations, and you would get even worse milage. Also check air pressure in your tires and make sure there at specs. Your could have the engine rebuilt but for that year/car its not realy worth the money and the time.

10

Thank you for helping me. I found out that my intake on block was completely blocked. Once cleaned working well. I am getting about 28 miles to gallon. That seems low to me but we got 17" low profile tire and that could be messing up the computer caluations. Sorry for not reponding back life's been busy.

Your Answer:

Beretta

Looking for a Used Beretta in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    unbelievableny
    Reputation
    430
  • #2
    Dan McCaig
    Reputation
    100
  • #2
    goldie11111
    Reputation
    100
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Camaro
19 Great Deals out of 513 listings starting at $11,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.