PCM Diagnostics & Tuning - got a 1997 WS6 get shit milage
05-07-2007, 10:56 AM
i just bought a car that has 100k on it. new opti. i am in town getting about 12 mpg. i know i should get more than that. when i cold start it. takes about 3 to 4 seconds of cranking while having the throttle open a little. it always smells rich as hell and also my temperature guage goes in upwards of 220-235 range. my friend thought it could be the temp sending unit on the heads. but i dont want to dick with trying to check that right now if its something with like the fuel pressure reg. any opinions are greatly appriciated.
05-07-2007, 01:25 PM
Heres a thought... Keep you damn foot out of it Keaton!!! LOL
05-07-2007, 02:01 PM
You can guess all day long....but, until you hook up a scanner to see what the sensors are saying, you'll never know. Could be a temp sensor, it could be O2 sensors, etc.
05-12-2007, 02:17 PM
only thing is that it always has to crank for like 5 seconds just to start and it always smells like gas. i dont really know what to look for. i was thinking possible sensor on the head. i dont have any codes being thrown. anyone have some suggestions
05-12-2007, 02:23 PM
Based on the symptoms, I'd check for leaky injectors / fuel pressure regulator or improper fuel pressure. That would be a good place to start.
05-13-2007, 11:49 PM
what would it do if the fuel regulator is bad. and also what is the pressure supposed to be at
05-14-2007, 05:10 AM
Fuel pressure should be around 38-39 at idle. Unplug the vacuum line on the FPR to simulate WOT and pressure should jump about 4 psi.
05-14-2007, 10:41 AM
If the FPR was bad, you'd probably see improper fuel pressure. Also, you may have a fuel leak at the FPR.
05-15-2007, 12:12 AM
my check engine light went on and i ran a check on that. and says the left bank o2 sensor is faulty or some BS. and right bank 02 low voltage. could that deal with the hard starts. i know thats definately a factor of gas milage and richness.
05-15-2007, 05:56 AM
When you put the gauge on it to check the pressure, turn the engine off and see how long it takes to lose pressure. It should take ~30 minutes to drop IIRC. If you have a leak, you will see it start to drop almost immediately.