94 GMC Safari Acceleration Issues

Asked by Apr 07, 2013 at 12:05 PM about the 1994 GMC Safari

Question type: Maintenance & Repair

Hi I need your help experts of Gmc's.  I have a *94 gmc safari sl 4.3 v6 mini van. Only 71k + miles by the way ill sell it for 1,500 as is.  It's having acceleration problems. Basically it all started when someone changed my water pump. I know it has nothing to do with it but recently someone told me there is a sensor behind it that regulates all sensors and if dirty can lag acceleration. Anyhow here's the issue when the car accelerates from 0 to 40 or more it lags and is no accelerating properly. I have to keep pushing the pedal tapping it faster and faster to accelerate it.  This comes and goes meaning sometimes it is normal but more often than not its lagging. When i turn off the car quick and turn it on it goes away but the acceleration is hardly the same as it used to be anyways and accelerates slower than normal. Once in a blue moon it goes back to normal the way it used to be.  Someone told me because when i turn it off and turn it on and it accelerates almost normal to normal sometimes that it has to do with the oxygen. Now im not a car expert but here's what ive tried and figured it could be been trying for months now. Had the fuel filter changed not it, had the fuel pressure checked not it, Fuel pump not it, catalytic not it. The mechanic who changed the pump said it was something oxygen related now how would he know that? I think he sabotaged it to get more money from me i haven't spoken to him since he disappeared. I think its either the throttle body part or whole thing spiders ect. Or its a bad wire somewhere its a pain to find i hope not. Or its the o2 sensor let me explain. I had a diagnostic with an obd1 sensor. The corporate office from GMC after many calls and hit a wall with an evil woman who thinks i wont find the upper vp's numbers i will eventually or if someone has it they are located in Detroit michigan has impeeded my progress for answers but according to them and others it doesn't have many sensors. Doesn't have a map sensor but im not sure about that. The obd1 test from someone who had the old red machine obd1 where years before 96  car parts compatible from 91 to 94 only i believe that's what corporate said not anything after 95. Anyhow the obd1 test said it was either the catalytic, fuel filter, or o2 sensor. So far the only thing i haven't changed or checked is the o2 sensor will do that this week finally been busy doing other things. someone told me on rare occasions the o2 sensor rd cause acceleration  problems. several mechanics said no but we will see. At this point any suggestions would help. Oh yes an my other theory is that its the computer. I had it changed a year prior after a questionable mechanic shop told me i needed it after battery died. Found out later after battery died how cheap and easy it is to change only 100 bucks or less and its plug and play. Was charged 400 bucks. Went back for warranty the guy said he lost my records. Will consult lawyer i think that's illegal he must pay but anyways don't worry ill rate him badly on Angies list for that prick.  Any help would be greatly appreciated. I'm going to try to post this in as many sites as possible. Ill keep you guys updated on my o2 sensor change. Don't want to spend too much money on this otherwise i would have changed all my theories already.  wb asap and please logical helpful replies and if you don't really know don't answer its already confusing enough.

7 Answers


It's safe to change the O2 sensor. They get slow after 100,000 miles and even if they do not throw a code, they will cost you MPG's. I always check RockAuto.com first and compare the price to what I find locally. If you need another computer, look at yours, write down the number and search eBay for a used one.


Sounds like a fuel pump volume issue and when you turn the key off and restart the engine the pump "catches up" and starts working again. Hook up a fuel pressure tester and take it for a drive while watching the pressure. The pump has enough pressure but isn't producing enough volume so while your driving (consuming more fuel) the pressure is slowly dropping off until it hits the point where the engine is starving for fuel.


The reason for the pump catching up is because the pump primes the fuel system when you turn the key on to restart it.

1 people found this helpful.

Hi, I really haven't got any answer for you but we both facing similar problem with same vehicle pls keep me posted on how you eventual solve this problem as this is painstaking and all effort draining my pocket Please respond to me on remiadelola@yahoo.com or text me on 07595840058, looking forward to hear from you soon,thanks... Remi

1 people found this helpful.

If the exhaust smells different than normal than its probably a fuel injector problem.


I have had a lot of years working on and trying to solve the problem ..anyways it can be a head ack to me what I think you need to do is a couple of things to find the right thing that is wrong with your van frist I would do a fuel pressure test on BOTH lines the pump line should be around 52 54 psi and your return should be around the same when you shut the engine off pressure should hold and not drop off if it dose you have a fuel pump and pressure regulator problem two do you have a elct. egr valve if so its dirty you can pull them spray them down with a good cleaner spray the hole where the egr go's and then start the engine watch out some carbon deposit may come out run for one mint. or so shut off install egr this will help a lot I clean mine at less once a year know as part of my maintenance as far as your 02 sensor it could put you in a limp mod but it really wont make you feel lack of power it would make you see a decrease in fuel mileage and maybe feel a little dead sluggish I feel you should check fuel check egr check plugs and wires and cap and rotor the ecm is either go or bad so if your starting and running it's good if everything checks out good then you may have to look in to the injectors. (serpentine injection ) one fuel pressure pump and 6 lines and nozzles sorry you can not buy and one part of this injection have to be bout as unit . hope this helps

Idle air control valve....

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