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BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17144
Experience:  ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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My name is ***** *****. I have a 1999 Chevy Venture that

Customer Question

Hi-my name is ***** *****. I have a 1999 Chevy Venture that stumbles and has loss of power shortly after you start accelerating. Started in early December. Does ok at highway speed unless you have to step on it to pass someone, then it stumbles also. I took it to a mechanic a couple weeks ago and he couldn't find anything wrong. He thought maybe the MAF sensor but didn't want to make me spend $300 on it. So I bought one from NAPA and tried it and it didn't help so I returned it. The spark plugs and wires are 6 months old, the EGR valve was replaced last summer, aolng with both O2 sensors and the fuel filter. The mechanic said the fuel system seems fine, but I wonder if it's the fuel pressure regulator. Any ideas on what to try?
JA: Thanks. Can you give me any more details about your issue?
Customer: That's pretty much everything I can think of. I put a few bottles of fuel injector cleaner through it on a big trip we took it on for Christmas. Didn't make any difference.
JA: OK got it. Last thing — Chevy Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 10 months ago.
Category: Chevy
Expert:  BOBBYSS replied 10 months ago.

Hello, my name is***** you for the question. Can you tell me if the check engine light comes on when this occurs? Does it change at all depending on if the engine is hot or cold?

Customer: replied 10 months ago.
Hi,
Sorry I forgot to mention that-no check engine light. It does it both when the engine is cold and when warmed up. If you are doing a normal acceleration like from a stop light or sign, it initially starts normally, then before it does it's first gear shift it just bogs down and has a loss of power until you get to a steady speed. Also if you are cruising at a given speed and need to put a little more accelerator pedal down to go up a hill or get around someone, it bogs down. Pretty severe loss of power. If you floor it it will eventually kick down to a lower gear and get some power back when the revs go up.
Expert:  BOBBYSS replied 10 months ago.

It sounds like the fuel pressure may dropping off as you drive. It may also be a failing catalytic converter. Both of these are common and will cause this without turning on a check engine light.

Customer: replied 10 months ago.
Thanks-so what do you think the next step should be? Fuel pressure regulator?
Expert:  BOBBYSS replied 10 months ago.

I would drive it with a fuel pressure gauge installed to see if the pressure bleeds off. Or replace the regulator first.