So at 45 mpg it felt like it was jumping between 3rd and 4th. Had the tranny checked and thats not it. Code reads say running lean in banks 1 and 2. Could that be the wires, plugs, optispark? What do you think?
I would start with the cheapest first, Plugs and Wires, because even if thats not the issue, it never hurts to do a tune up, then worry about the optispark. Could also be a bad injector? But running lean on 1 and 2 would kinds rule out an injector, unless some after filter fuel line rust dislodged and partially plugged up 2 injectors, unlikely but never rule anything out until the problem if found and fixed..
Does it give you problems when you drive in D as opposed to overdrive? It shouldn't even go into 4th at less than 50 or 60 I think.
First, do a visual inspection, and listen for a vacuum leak from a rubber hose - that'll throw the same code!
Lt1 cars had OD only. he would have to leave it in 3rd. I would guess O2 sensors. usually they stay in closed loop and that causes rich running. but it is possible that they are causing lean.
Lt1 cars had OD only. he would have to leave it in 3rd. I would guess O2 sensors. usually they stay in closed loop and that causes rich running. but it is possible that they are causing lean. check your gas cap too! i had a gas cap seal go bad on my s10 and it did the same thing. or any other vac leak will lean it out.
Thanks for the feed back all, I will do the visual and probably need a tank or two off good gas and some fuel system cleaner. Any recommendations on that? And my shocks in the rear are wasted. Can I even get replacements that work with the auto suspension thing? Where can I get-em cheap? Thanks again all, just getting started on the beast.
Need airshocks for the load leveling to work. I have always used regular ATF as fuel cleaner, as its very high in detergent and will also help lube up the fuel pump. $1.19 a qt at the dollar store and will work better then any $12 a pint crap. 1 qt to a full tank is what I always use.
Rear Shocks cool, now what about the rear shocks? I need those ASAP, can U just get regular air shocks? What is the device that plugs into the shocks for the suspension? I only had a quick look when it was on the rack, should have taken a freakin picture. Anyway, does that just plug into what the air gos in or what?:confused:
Use standard replacement air shocks have the same or similar nipple/fitting that will allow you to connect the factory air lines to them. AC/Delco, Gabriel, and Monroe have replacement air shocks. Back to the original question. What code # came up? Can you could provide more info on what exactly the car is doing, and when it's doing it? That would help all of us to narrow it down a bit. Does it do it all the time or intermittently? How many miles does the car have? What do you know about it's maintenance history? Is the car warm or cold? Light throttle pressure or heavy? Mike
Details What code # came up? Can you could provide more info on what exactly the car is doing, and when it's doing it? That would help all of us to narrow it down a bit. Does it do it all the time or intermittently? How many miles does the car have? What do you know about it's maintenance history? Is the car warm or cold? Light throttle pressure or heavy? The code was: Lean on bank 1 and bank 2. The "jumping" occurs at 45mph with light throttle, both drive 3 and OD. It has been pretty regular (85% of the time) but might be getting less frequent. The car has 83,000 miles and I don"t know how ling it has been sitting, I have put only 150 miles on here trying to run out some crap gas, 1/2 tank to go. Know nothing from the maint history, from the looks of the PVC valve i replaced I think TLC was minimal to say the least. I think the car was warmed up when the jumping occurred. I had a friend of a friend who is a mechanic at a dealership take a look and he said to get a couple of good tanks of gas and some cleaner, like sea foam or something similar. Most likely a vacuum leak or crap gas. The Running Lean he said would be apparent from looking at the engine if it was a really major problem. He said that parts of the engine would be discolored if it was running lean in a major way. Oh and the ABS light comes and go's and he said that would be / could be a PITA to track down and not to worry about it. check out this link below a friend gave me, any thing like this out there for roadmasters specifically? I know it's similar but ultimately I a new GM guy and not sure how similar it actually is yet. http://shbox.com/page/index.html Thanks so much for everyones help.
If you have only had the car for a short time and put just 150 miles on it, than I agree with your friend. I'd put a few bottles of dry gas in the tank as well. If after a few tanks of fuel and it's still jumping or shuddering on you give your ignition a good look and put some new plugs, and maybe wires on it. The ABS system is pretty simple on these cars. The ABS module (under the hood right above the steering box) is usually problem free. There is a sensor in each front wheel, behind the rotors, and one sensor in the rear axle center section that reads pinion shaft speed. If the car has been sitting it's a good bet that you could remove the front brake rotors and clean up the sensors (mounted to the steering knuckle) and the reluctor wheels (mounted to the inside of the rotors) with a wire brush. Might have some dirt, mud, rust, and/or critter nests inter fearing with the signal. Could be a simple fix. That F body site is kinda neat, I never saw that one before. I've never come across one like that for B body's either. For more specific Roadmaster info try these. http://gmlongroof.4umer.com/forum http://www.impalassforum.com/vBulletin/index.php Good luck with your Roady. Mike
Has anyone re flashed the PCM? I had the same issue when I did some adjustments to PCM of a 1994. They overlapped and at highway cruise it shifted from 3 to 4 tom 3 to 4 etc... I changed out the tune for Caddilac V4P towing option and it has some incredible changes. Actually revs a little in each gear and can feel the shift instead of one big sluuuuuuush...
