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Old 05-04-2013, 08:09 AM   #1
AllCarFan
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too much air????!!

2005 2.0 with a Cosworth CAI, Cosworth IM, 67mm TB, header, 2.5" exhaust....Tom Tune.

Now, I havent been able to datalog my wideband yet, but other than that Tom says my tune looks good.

Having some issues though. My car bogs, studders, shudders, and spits from idle to 3000rpm i first and second gear. As soon as I get to about 3000, I start to accelerate. The bog is so bad that whe i try to get out into traffic, and give it throttle, the car nearly dies. 1/2 throttle and WOT anything below 3000rpm and it makes no difference....actually, full throttle below 3000 rpm makes the car SLOWER.

Clutch and flywheel are both good. Car has 42k miles on it. I dont have any vacuum leaks.

Ideas? Tune? plugs? too much air from mods for engine?


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Old 05-04-2013, 08:58 AM   #2
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may want to test your throttle position sensor. Not sure if your tuner allows reading PIDs. I imagine it probably does. look at TPS voltage and percentage.

While you're there, see if it will show fuel trims and 02 sensor voltage.

is it fine in other gears or did you not make it that far? Data log is the best thing to do though...find time to do it.
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Old 05-04-2013, 09:38 AM   #3
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I datalogged and sent it to Tom. Hopefully he can see what is up. He chose the PIDs. Its not so much the gear as it is the RPM. Anything below 3000 and it bogs. Now, I know that is going to lose a little off the line with mysetup, but I shouldnt be thrown fwd in my seat and it shouldnt spit ad sputter.

If I am in 5th...and floor it...i go just as fast as if I was 2/3 throttle. Of course, that is hard to judge with the heavy spring on the CFM TB.
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Old 05-04-2013, 10:26 AM   #4
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I was having idle issues with a very similar setup. swapped and cleaned sensors, smoked the IM to check for vacuum leaks (none), etc. Tried with the stock TB too

I would fire it up and it would rev up a little, do two or three really quick blips of throttle, then kind of settle down. stalled a lot too. never figured out what the problem was as it blew out the main seal (dont do a PCV delete!!) and i parted the car due to the headaches of having someone else "fix" it. found that it did have an exhaust leak right before the wideband bung (idiots that put it in didnt use a gasket on the flex, you could see daylight through it) but who knows how much that effected it.

There was a certain point where it had a high idle and would come down slowly, then the next tune it came down a lot quicker but wouldnt catch it in time. couldnt figure out what the issue was and Tom was about to try a fresh file just in case mine was corrupt.

so I guess check for Vac leaks, clean and swap IAC, TPS, check for exhaust leaks. Hopefully he finds what the issue is with yours!
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Old 05-04-2013, 10:55 AM   #5
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Everything you have metioned has been done! Its just an annoying spit ad sputter under load below 3000rpm. It revs great!
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Old 05-05-2013, 01:12 AM   #6
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almost sounds like cam timing or maybe a super retarded or advanced ign curve from a sensor gone crazy try un hooking the maf and starting it will make it ignore the maf and go to the fall back tune with your mods dont drive it hard like this just see if it help your low rpm problem
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Old 05-05-2013, 08:36 AM   #7
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Quote:
Originally Posted by Buickboy View Post
(dont do a PCV delete!!)
You didnt blow a rear seal if your PCV delete was open and breathing good , this actually has less psi on the internal part of the engine then is you keep a PCV

Tom
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Old 05-05-2013, 08:37 AM   #8
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This last datalog you sent me I saw a lot in I think it was yours I said NO WOT till we talked ?

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Old 05-05-2013, 08:56 AM   #9
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Tom, I know.....no WOT until we talk. No worries there. I get my truck back today, so I can drive that. Just hoping me/we, someone will be able to figure out the horrible low rpm bog.

It was hard to get the info I got you yesterday. It was flooding here. Friday night cops were EVERYWHERE!!!!
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Old 05-05-2013, 11:50 PM   #10
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No worries , I see some issues that wasnt there in the last log

Tom
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