Hmm, running crazy rich and getting better than average mileage doesn't add up.... weird.

 

If you guys remember my dyno runs, (with wideband) you'll notice that it made great hp and a decent a/f ratio, but still a tad rich until about 4,500. After 4500, it would just go down the tubes. By 6k, it would be so rich, that the car would start hesitating.

No idea why the computer thought i was flowing so much air at anything above 4,500. But the s-afc has since fixed it.

Fuel milage has alot to do with exaust according to Rob@Pineapple. I do know that i have a realy free flowing/effeicent exaust. Otherwise i would'nt have made peak power at 8000rpms. Looking back, it might have made even more power higher, but i decided that it was'nt worth beating on the engine. So, i just took it to 8000. Not that i'm scared to take it up higher, but the fact that the motor was running way to rich...so why abuse it? Since the s-afc install, i've had a couple run in's with the rev-limiter. The max rpm i try to shift at is 8,500, as stock apex seals are in the danger zone after that.

I've getting married this next week and currently having a house built, so i have to slowly save up for my next dyno session when i'll have the s-afc tuned in.

CJ

 

thanks tru, I will try it out this weekend.

 

Okay, if your brake power assist isn't working, then you might have a bad vacuum leak somewhere. Find the big vacuum line from the engine to the booster (behind the MC) and make sure it's good on both ends. There is a check valve in the soft hose at the booster end, btw, so make sure it is properly oriented (to keep the booster in vacuum). If you have a big vacuum leak, this could be contributing to your other problem.

As for high fuel consumption (assuming no connection to the brake issue), I would suspect the Water Thermo Sensor in the water pump housing. I had one of these go bad and it caused high fuel consumption by telling the ECU that it should be in warm-up mode. This is just a "usual suspect", but just about any sensor can trick the ECU into doing something weird. Air Flow Meter (AFM) and pressure sensor are other likely suspects.

 

blake, how would go about debugging which sensor is whacked in my vert, should I bug an ECU scanner?
TIA

 

how can i test if my trailing plugs are fireing???????

 

stick your tongue on them and get someone to turn your car on.

no j/k that might give you a bit of a shock i am tired sorry for the useless post

Justin

 

Check and make sure your spark plugs are wired correctly. Some dumbass at the dealership I took my car to switched the leading wires. I suppose it ran pretty well all things considered, but I was getting really crappy gas mileage until I figured out . Also, be careful if you install any extra ground cables. I once switched my battery and somehow managed to forget to reconnect a 4 ga. ground and left it loose. Later that day I made a quick lane change, the cable hit something, and I fried my entire ignition system.

 

I was gonna say 'get a ecno-ghetto-sport car' a.k.a. a honda

 

Every time I get a car that needs the intake system cleaned and the 6port sleeves unfrozen, after i regasket and re-hose the vaccum lines i removed, the car gets about 20% better milage.

I would put big money down that says this is your solution.

 

i have a 88 na vert too an the gas mpg sucks also. when stopped at a trafic light the fumes will burn your eyes. i can't find what it is / uless it is the injectors leaking or not getting the right sigs from the ecu. on the brake thing have you tried to bleed them may have air in the lines, might help. good luck.

 

1)full tune-up(replace all filters and change spark plugs, check timing, idle, etc.)
2)clean your fuel injectors
3)maybe even replace your O2 sensor

the "regular" mileage is 17city/24highway

 

The hose going from your Brake booster could be off of your car. My FD was like that for about 30 seconds before I figured it out.

 

take a screwdriver, hold the handle, and place the metal end into where the spark plug would go. Do all of this while the car is OFF. Place the handle near any metallic, and have someone start the car. BE CAREFUL because if you don't hold the screwdriver close enough to metal, YOU will be come part of the ignition system i.e. OUCH!!!!!!!!!