Resetting Fuel Adaptives........Do I need to?

UncleBoost · Post by **UncleBoost** » 14 Jan 2005, 09:30

96 850 turbo wagon
Was getting 2-1-2 & 1-5-3 (F&R O2 sensors) <---------Changed both.
Now getting 2-3-1 code (Lean or Rich in Stage II.......The only code present now)
Took Battery off for approx 2-3 hours.
2-3-1 Code comes back after 13 miles.
Car still Jerky and hesitant on acceleration. Moderate Boost.....not 100% like it used to be due to this problem. Good Low end Accel and really throaty sounding from a "Stand Still Take off" but starts to cut back in power as boost increases. Picks up more speed as I teeter the gas pedal as to keep the boost down some. (Like it can't take all the boost its getting almost like "Fuel Cutting out or starving for fuel")
My question is, do I need to have the
Fuel adaptives RESET in order for my repairs to be of benefit?
Do I need a Scan tool to reset the fuel adaptives? or should taking the battery loose cure the problem on a 1996 850 turbo wagon?
Could it be a weak Fuel Pump?
Will a scan tool pick up a code for low fuel pressure under load?

Sorry for all the questions.

Thanks
Uncle_Boost

Tsquared · Post by **Tsquared** » 14 Jan 2005, 16:47

P0231 is a Fuel Pump Secondary Circuit Low with ODB II on a 96 850

UncleBoost · Post by **UncleBoost** » 16 Jan 2005, 11:03

Ok, I had it checked at my local Auto Zone with an Actron 9135 code scanner. Turns out the only code it shows is P??? Dang it I forgot the code but it says its burning Rich. Only 1 code is there.
So I figured dirty Air filter. Erased code, bought new filter, now......30 miles later code comes back. car still jerky on accerlation. But it ran the Best after the code was 1st reset when I left autozone....It fricken Blazed! Then it got worse....eventually the check engine light came on again. Hmmmmm
WTF man....
New Plugs, 028 gap (DONE)
Cap and Rotor (DONE)
Fuel filter (DONE)
Vacuum hoses checked (DONE)
New Idle Air Valve (DONE)
New O2 sensors front and rear (DONE)
Injectors cleaned...(added Intank injector cleaner) (DONE)
Throttle Body cleaned (DONE)

231 is Fuel pump Stage 2.....????
Does this mean the Fuel pump isn't kicking into high gear? Or 2nd speed?
Could the Relay be the problem? or is the fuel pump not keeping up with the demand from the engine? If it were burning Rich wouldn't that mean too much Gas under load?
Pressure Regulator?

Don't know what else to do
Lets say for the sake of argument, some how the wrong O2 sensor was installed Post Cat. Would that screw up the signalling info to the ECU and make it think something were wrong when it really isn't?
Just a guess since I got the Post Cat O2 sensor from the guy on Ebay selling them for $70 bucks. Its number matches whats required for a 96 850 turbo though.

Stumped!

Da' Moose · Post by **Da' Moose** » 17 Jan 2005, 00:19

Have you checked the condition of your plugs and ohm out your plug wires. Remember just because a part is new, it by no means that it is good. If you have a leaky injector or a bad plug or plug wire the place to look would be the spark plugs.

UncleBoost · Post by **UncleBoost** » 18 Jan 2005, 07:38

Youre absolutley right about a new part could be bad. I haven't really checked the plug wires since I haven't gotten a "Missfire" code. I will check on it.
Now having said that....I just recently found out that its possible that the fuel pump installed back in the summer may have been for an NA 850.
Can anyone tell me the difference in the 2 fuel pumps?
Please correct me if I'm wrong, but I assume the Turbo pump would have a higher fuel delivery rate. Only thing though, the car has run fine until recently. So if the pump was incompatible wouldn't it had been that way from the start?

What should the resistence be on the plug wires?
WHo has 850 turbo fuel pumps.....Reasonably priced?

THanks for your help everyone!

Unk

Post by **matthew1** » 18 Jan 2005, 10:19

Leaky injector?
https://www.matthewsvolvosite.com/chat/p ... php?t=2132

At least test for pressure when the car is off. There's a schaeder valve at the end of the injector rail. It should squirt gas.

UncleBoost · Post by **UncleBoost** » 18 Jan 2005, 12:02

Hmmmm....I will perfom the leaky injector test. But wouldn't that cause it to start difficultly and blow out black smoke?

Ahhhh man....let me tell you this. The Spark plugs I pulled out, (last month) the Electrodes were worn down quite a bit but the plugs were white as hell like it had been burning "Lean". Hardly any old burned oily look whatsoever. This was before i changed the O2 sensors though. Seems like changing the O2 sensors has opened up a can of worms!

Could it be that this thing...Turbo 850, hates platinum plugs?
I heard that the Turbo hates Bosch Plats....is this true?\

UncleBoost

Post by **matthew1** » 18 Jan 2005, 13:40

But wouldn't that cause it to start difficultly and blow out black smoke?

Like the owner in that link, probably yes.

Either way check for pressure. Lack of pressure can be caused by more than just leaky injectors.

UncleBoost · Post by **UncleBoost** » 19 Jan 2005, 07:13

Ok...Thanks Matthew. I will have the pressure checked.

Let me ask this, Given the scenario of getting on the Interstate and you Punch it. Pedal to the floor, car downshifts and start to Blaze. Does the fuel pump always run at the same speed or does it have a secondary speed (faster) to keep up with the engines demand for more fuel? Does the ECU tell the Relay when to energize?
I wonder if the relay Pulses or does it have a solid state voltage Ramping circuit....

Thanks

UncleBoost · Post by **UncleBoost** » 20 Jan 2005, 21:48

<------------------Hey Guys!! Thanks! You two......

Well, since I am waiting on a fuel pressure gauge to come in, I decided to try a couple of things. Actually, It only took 1 to fix it. So far, knock on wood. I was gonna remove the AMM / sensor and clean it with Alcohol. But I drank it all....No really...I was gonna clean it, and change the Fuel Pump relay for starters. Changed the Relay and drove the car. Whoa!
Ran like a scared rabbit. Boost seemed lower than usually but I got that Throaty sound back and plenty of Torque and acceleration. It was cold too. I didn't warm the engine up so my test run, though pleasing from the normal Sluggish, Bogged down feeling is inconclusive. Or should I say, I want to really drive the car a while before I make the determination that the Relay Fixed the problem.
Typically, the 103 relay is Green in these 850's from what I have seen....The one I pulled out was RED...What??? ..go figure.
I will keep you guys posted.\\

Uncle