in desperate need of diagnostics
Thread Starter
Staging Lane
Joined: Jun 2012
Posts: 75
Likes: 0
From: sac
in desperate need of diagnostics Don't really know where to start. Umm I wire tucked my car it ran fine for a a few days at idle never drove vehicle. Then icm and coil went out changed them. And plugs and opti all at the same time. Fired up but would not stay running after that so I changed my fuel pressure regulator.( used ) car seem to run fine. Tightened up a few lose ends test drove it on my street. Parked it test drove it again two days later it died at the end of my street as I was doing a 3 point turn. It fired right back up. Drove it to the house hammered it to the floor its def running on all 8. Get in the drive way rev it up as the rpms are dropping it shuts off. Crank it over fires up idles fine for a sec rev it on its way down it dies and it didn't want to fire back up. Sorry for the run on sentences and grammar slightly pissed any input about the car would be great. O and the new opti has a vented cover I don't have it plugged or no vqc running to it. And the motor is untuned with cam and bolt ons if it helps
Thread Starter
Staging Lane
Joined: Jun 2012
Posts: 75
Likes: 0
From: sac
The guy in sac doesn't come to your house and tune you drive it to him. Every one is scared to drive with no tune. I have drove a no tuned car around for over 2000 miles with zero problems. Any other guesses
TECH Fanatic
Joined: Sep 2010
Posts: 1,037
Likes: 2
Hm engine now is taking in a lot more air.
PCM is saying "hm the MAF is telling me a lot more air is coming in, the o2s are telling me its running lean, I better compensate. Crap I hit the max for my compensation and I can't compensate anymore, yet we are still lean."
Engine then says "Yes we are running lean! Time to burn some valves up and destroy stuff!"
As stated above get a tune.
Its the opposite of putting bigger injectors in without a tune.
PCM is saying "hm the MAF is telling me a lot more air is coming in, the o2s are telling me its running lean, I better compensate. Crap I hit the max for my compensation and I can't compensate anymore, yet we are still lean."
Engine then says "Yes we are running lean! Time to burn some valves up and destroy stuff!"
As stated above get a tune.
Its the opposite of putting bigger injectors in without a tune.
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Mail order tunes are not junk. Maybe do a little more research on the topic.
With major modifications such as a cam, you are risking damaging your engine with a stock tune or at the least causing unnecessary wear on engine parts, nor will your engine perform nearly as well as is could with even a base tune. A mail order tune is a "base tune" to get you where you need to, such as to the dyno tuner. For a simple bolt-on only car, a mail order tune is likely all that is needed, and is surely recommended.
Popular mail order tuners would be pcmforless or Moe Bailey (Moehorsepower), Ed Wright might do mail order tunes, though I'm not sure. For my LE H/C/I 355 build I had TPiS do my base tune and I think they did a great job.
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You need to find a tuner who you can lay out all your mods to and get them to do a baseline tune for you. Then take the car to them so they can strap it down and iron it out. Tunes your problem