Engine is FLAT SPOTTING BAD! Tuning issue???
Engine is FLAT SPOTTING BAD! Tuning issue??? 
After I got it tuned, it has a very bad flat spotting issue. It is almost not drivable. It happens all over pretty much, you start going and it just hesitates/ studders/ and will NOT accelerate. Shift into second and hit the gas to go and it flat spots agian until you just say screw it and put it at WOT. Could I just need some more tuning?Pretty much go try and take your MAF out of your car and try to drive it...thats what its doing. Sometimes it idles so bad that it seems its running of 1 cyl.
Just for info:
-MAF is NEW
-Pretty much the whole top end of the motor is new
-New plugs and wires
-Stock coil packs( I thing may be the cause..)
-Origional TPS ( Ive heard of issues with that)
-O2's two months old
I've gone over everything I think it is... so I may need go back to my tuner.
On The Tree
Joined: Nov 2005
Posts: 191
Likes: 0
sounds like your tuner isn't paying attention to Air fuel ratio. sound like you are bad lean and need some fuel. this will smooth out the stumbles and take a look at the ve tables. also check to make sure all your coils are good and have good grounds. and no vacum leaks. Then have the air fuel ratio checked again.should want about 12.8 for good hp and no lean codes
Originally Posted by wilddawg
sounds like your tuner isn't paying attention to Air fuel ratio. sound like you are bad lean and need some fuel. this will smooth out the stumbles and take a look at the ve tables. also check to make sure all your coils are good and have good grounds. and no vacum leaks. Then have the air fuel ratio checked again.should want about 12.8 for good hp and no lean codes
I've been taking it to Jeff at Carolina Auto Masters, he is the best in the East Coast and travels all over the US guest tuning these cars, during my dyno tune we dicovered I had a bad MAF, so we replaced it and went from there. I guess maybe he wasnt as patient with it, but it ran "ok" on the test drive. But obviously it isnt right. I will do all I can to check it out then I'll go have Jeff look at it again. I really just want this thing running right after putting all the time and money I have in it.
No SES codes, only thing I can think of is a coil pack gone bad or a bad connection somewhere. Any other suggestions??
No SES codes, only thing I can think of is a coil pack gone bad or a bad connection somewhere. Any other suggestions??
Originally Posted by dalejr8ls1
I've been taking it to Jeff at Carolina Auto Masters,
Originally Posted by ringram
Take it to someone competent.
Originally Posted by jay_99z
I agree with ringram. If you want dyno numbers go to Creech. If you want to drive it.....find someone else.
, charlie looked at the tune, and started laughing, the tune actually was fueling less then stock. lol i dont know what he was thinking, but the car had stock injectors didnt have to rescale the injectors, should have been straight forward. to make a long story short, the car got retuned by charlie ended up putting down 430 rwhp-409rwtq, with the exact same mods, actually is post is on the dyno results section. up until this point i had heard nothing but good about jeff creech, but after seeing this, i could do a better job, in fact the stock tune did a better job. Trending Topics
Originally Posted by RyneZ06
jeff creech flew out to cali and did some dyno tuning on cars at tuning tech., he tuned my buddy trans am, 232-234 cam, stock injectors, longtubes and exhaust. the car never idled right, never really ran strong, finally i hooked him up with charlie at a&a corvette, we put it on the dyno for a baseline, the a/f was 15.3 , charlie looked at the tune, and started laughing, the tune actually was fueling less then stock. lol i dont know what he was thinking, but the car had stock injectors didnt have to rescale the injectors, should have been straight forward. to make a long story short, the car got retuned by charlie ended up putting down 430 rwhp-409rwtq, with the exact same mods, actually is post is on the dyno results section. up until this point i had heard nothing but good about jeff creech, but after seeing this, i could do a better job, in fact the stock tune did a better job.
, charlie looked at the tune, and started laughing, the tune actually was fueling less then stock. lol i dont know what he was thinking, but the car had stock injectors didnt have to rescale the injectors, should have been straight forward. to make a long story short, the car got retuned by charlie ended up putting down 430 rwhp-409rwtq, with the exact same mods, actually is post is on the dyno results section. up until this point i had heard nothing but good about jeff creech, but after seeing this, i could do a better job, in fact the stock tune did a better job.
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Verdad Gallardo Well I guess I thought Jeff would do the best job, but so far I dont like whats going on. I just pulled some plugs and they were burnt white, running very lean. I'm not sure if some other sensor is going wack to make it do this. Found one plug wire that was not fastening right to the coil pack...brand new MSD's. Couldnt find any intake leaks at all, this thing is running so bad and idling so bad that I cant believe it isnt throwing an SES code.
Oh yeah and I just discovered my MAP sensor was very loosely fit into the intake. Seems to be a common problem with the FAST 90's. So I will tape that up and make sure that is sealed. I just cant seem to figure this thing out... this HAS to be a tuning issue, Jeff can tune but he just needs to put more effort into getting it just right.
TECH Enthusiast
iTrader: (17)
Joined: Sep 2005
Posts: 619
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From: Detroit, MI - Camp Pendleton, CA
I would have him look at it again and monitor the A/F ratio. Like everone else is saying it looks like hes just disregaurding it. If that doesnt help it, take it to someone else who is experienced on tuning LSx engines. If it fixes it have that SOB pay for the new tune. If not threaten to take him to court since its a no brainer he doesnt know what hes doing after a GOOD tune.
i never heard of anything bad about Jeff Creech..a lot of people down her ein hinesville, savannah area recommend him highly..first i have heard of anything like this..i am going ot vengeance racing to get my tune done right.
i spun a rod bearing in my old 99 LS1 and was able to score a smoking deal a 18K mile 02 Z28 long block for $1500 ..yup thats right. i pulled it apart and added the LS6 oil pump, DBL RlR timing chain, chromoly rods, comp lifters, and my lunati cam..just need to get it tuned now and i will be going to VENGEANCE RACING Saturday* next weekend* to get it done by RON.
i spun a rod bearing in my old 99 LS1 and was able to score a smoking deal a 18K mile 02 Z28 long block for $1500 ..yup thats right. i pulled it apart and added the LS6 oil pump, DBL RlR timing chain, chromoly rods, comp lifters, and my lunati cam..just need to get it tuned now and i will be going to VENGEANCE RACING Saturday* next weekend* to get it done by RON.
Originally Posted by dalejr8ls1
Well I guess I thought Jeff would do the best job, but so far I dont like whats going on. I just pulled some plugs and they were burnt white, running very lean. I'm not sure if some other sensor is going wack to make it do this. Found one plug wire that was not fastening right to the coil pack...brand new MSD's. Couldnt find any intake leaks at all, this thing is running so bad and idling so bad that I cant believe it isnt throwing an SES code.
Look.....I'm not just here to bash Creech.....I'd like to offer some advice to you. I have seen this routine many times. People get good dyno numbers and leave happy....only to have the car run like ****.
If this story plays out like it usually does....he will tell you that there is something wrong wth your car. DO NOT let him sell you on this BS. Before you start throwing money at the suggested bad parts....ask him to look at the tune again. Don't leave his shop until it's the way you want it.
I have seen a few get so fed up that they went to another tuner and pay again. You decided to go with him. Force him to make it right. He is pretty childish so threats and complaining will only bring out the 5 year old in him. Be friendly as long as you can and you might get somewhere with him.
Good luck.
TECH Enthusiast
iTrader: (17)
Joined: Sep 2005
Posts: 619
Likes: 0
From: Detroit, MI - Camp Pendleton, CA
If this guy is as everyone says he is, including yourself, then you will have to use to make it right. Agreed you should start off friendly, but if he takes you around the block you don't have to listen to him blowing smoke up your ***. And if he wines like a little girl, what does that have to do with the customer? If hes done it more than once than he should be shut down and quit his bitching. Take the nice approach and if he blows smoke up your ***, have someone else do it and have him pay for it. Hes running a business here and his top priority should be to take care of his customers.
I have some respect for the guy, hes cool and all and that shop does some serious work and puts out a LOT of business, I'll just press him to get the tune just right this time so I'll never have to come back.. I'm in $500 just in tunning and dyno time so I say I deserve a perfect tune and a streetable tune at that.