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ambient_whooshing t1_iy002ry wrote

I changed my battery after letting my 98 sit for about 7 months without running. It wiped the ecu and kept failing inspection for emissions. I was told to drive it for a full tank. Then that it wasn't enough to ready them. Told to drive another tank. I haven't checked for codes since then but know that you may need it stable enough for 500 miles before it passes.

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PoorInCT t1_iy0a6xa wrote

Yah that sounds legit.

Certain tests cant run if the tank is less than 15% full or more than 85% full.

My chevy service manuals gave all sorts of technical info as to minimum trip time, temp of coolant, how many warm ups, how many accelerations from 0 to 25, 45, 55 and corresponding decelerations, time between 45-55, while the fluid was between certain temps, and some other things that would have to happen to let the ecu give you a pass/fail as opposed to not ready.

Best bet it get the warm, don't run near full or empty, and do alot of reasonable accelerations and decelerations on local, state, and on/off ramps on Interstate.

Advance auto can read your obd for free or you can get a reader on Amazon.

Slow evap can be as simple as a gas cap replacement or as bad as thousand dollars where they just replace everything.

Back in the day people would pinch off the tubing to a vacuum pump that was dedicated to doing the test..thats a felony now. In at least the last decade the computer is monitoring pressure in the fuel tank while the engine is running to figure out if any thing is leaking.

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ambient_whooshing t1_iy10cv3 wrote

I chuckled at getting it to 55. That's terrifying. 4" lift with another 100lbs on the roof and super soft worn front suspension. New emu rear I did a few years ago though. The only thing actually wrong with the car is the fuel pump assy and the Bosch one is discontinued 78685 or something. I'm going to swap with a junkyard one but want to get it to pass first in case I need it for the summer. As of now it's just used for camping and towing our little 15' Bayliner.

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PoorInCT t1_iy11grg wrote

Good luck with that. I wish I had the time to actually fix something!

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g-wilks OP t1_iy7d9tp wrote

I recall going about 50 on the highway, at 3500rpm! Mine has a 6.5" lift, with 32" Mud Terrains, but I'm going to be swapping to 33" All Terrains! That speed is a little sketchy, but luckily most of my commute I can take secondary roads. Right now, with fuel at the prices it is, I'll just be using my Jeep in the winter, as I use my 1993 Civic for summer. It saves so much fuel, and is just shy of $30 for a full tank that'll last me 2 weeks! My Jeep's average MPG with the lift and tires was around 10-12MPG! No Bueno! I'm definitely thinking about regearing too!

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g-wilks OP t1_iy7dyyg wrote

I replaced my battery too, and it's been disconnected many times as I'd just go out to start it every month to let it run up to temp, just to make sure everything was still operating as it should. It does have really old gas in it though, so I'll definitely be filling it up, and running it around for a little while, then filling again to the brim before I go for the inspection. I'll be testing for codes with my cheap scanner before I go too!

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