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Old 07-11-2008, 07:12 PM   #1
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I need a TPI specialist

Im having alot of issues with my TPI setup on my SS. I cant figure out this damn thottle body pop, and im in need of a TPI specialist/someone familiar with tuning a tpi engine. i took it to a few local shops and they were retarted.
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Old 07-11-2008, 08:07 PM   #2
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well ... whats it doing? Whats the "pop" you speak of?
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Old 07-11-2008, 08:17 PM   #3
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i would describe it as a lean pop around 4k rpms. im getting no help on TGO, and have posted on other boards for the past 2 months trying to get some kind of idea. i have done all that i can do and need to find someone who specializes in this type of injection.
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Old 07-11-2008, 08:42 PM   #4
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www.chevythunder.com he knows a lot IMO
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Old 07-11-2008, 09:08 PM   #5
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sounds like it could be an issue with low fuel pressure, for starters check the pressure at the schrader valve...if its low change the fuel filter, if its still low it may be an issue with the pump which is fairly common. If, though, the pressure is 40 and 45psi(not exactly sure off hand) i would give a fuel injector cleaner a try as it could be an issue with worn out injectors. Another common thing I've seen on older year TPI cars is the FPR going bad and or leaking. I would check that over and make sure the vacuum line is not split or damaged in anyway. That should give you a good start in the right direction. good luck with it.
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Old 07-11-2008, 11:47 PM   #6
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Id also check timing.
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Old 07-12-2008, 07:41 AM   #7
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thanks guys. ive been over chevy thunder quite a few times since ive considered doing and after the swap. he pointed me towards the ESC, knock sensor and egr all checked out. i did have a fuel pump issue a while back which was corrected, but i will change the filter and check my pressure again. also i will pick up a can of fuel injector cleaner. i have been running 93 octane. Im pretty sure the base timing is set by the ecm so perhaps that can be an issue
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Old 07-12-2008, 09:41 AM   #8
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Ok MAF, SD. what does the engine have done to it, heads, cam, exhaust, compression ratio? That would help!
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Old 07-12-2008, 03:46 PM   #9
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MAF, and it really has nothing done to it but headers and exhaust
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Old 07-12-2008, 04:48 PM   #10
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timing on a tpi motor is nothing that can't be addressed with a 14mm(9/16) and a thick glove
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Old 07-12-2008, 05:13 PM   #11
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well then how bubba i dont know
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Old 07-12-2008, 05:22 PM   #12
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just loosen the bolt on the distributor hold down, and turn it counter-clockwise to advance and clockwise to retard. If you have a timing light that would be your best bet. if not, advance it till the motor starts to ping or stumble then back it of till that stops. its not the most exact or best way to do it but if you have a timing issue that should help.
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Old 07-12-2008, 05:41 PM   #13
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checked the fuel again. its a steady 42 pounds even at the pop
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Old 07-12-2008, 06:26 PM   #14
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retard your timing 2 degrees and run lucas fuel injector cleaner through it...get the big quart bottle and dump the whole SOB in there....after about 20min of driving if the pop continues reset your timing call Josh at JSperformance....I'm sure he'll be in here soon to give his $.50
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Old 07-14-2008, 07:14 PM   #15
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ok idk how or why this got moved, seeing as i already have a tech thread pertaining to this issue. i was really looking for a name or number of a place who can help me out. hence why i put it in the lounge where everyone can see.
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Old 07-14-2008, 07:49 PM   #16
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JSSPEEDANDCUSTOM.COM.

We can also burn a custom chip for you once we get your issues all sorted out.

Josh
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Old 07-14-2008, 07:56 PM   #17
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Quote:
Originally Posted by bubba428 View Post
timing on a tpi motor is nothing that can't be addressed with a 14mm(9/16) and a thick glove
would you stop giving out bad information. thats a bad way of adjusting timing with a tpi computer. if his motor is stock, you set base timing at 6 degrees advanced and let the computer do everything else. otherwise, you a. run the risk of too much advance = detonation or b. mask a problem that could be there with the ESC or related components.

A datalog around the area of said "pop" could give a freeze frame of load, MAF reading, injector pulse width, battery voltage, spark advance, knock, etc etc and may be able to pinpoint something wrong.

Call JS Performance. Its worth it.
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Old 07-14-2008, 08:07 PM   #18
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JSSPEEDANDCUSTOM.COM.

We can also burn a custom chip for you once we get your issues all sorted out.

Josh
215-783-4645
I'd call josh he comes very highly recommended from pretty much everyone on the board.... hell hes going to be pretty much building my 3rd gen
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Old 07-14-2008, 08:21 PM   #19
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Thanks rich! I didnt forget about you but we tried to put the boat in the water and it seems that it has a leak. So in all my free time I get to fix that as well!!!
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Old 07-15-2008, 12:42 AM   #20
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Thanks rich! I didnt forget about you but we tried to put the boat in the water and it seems that it has a leak. So in all my free time I get to fix that as well!!!
what free time man if your as busy as me between corrections and detailing you dont get much
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Old 07-15-2008, 07:11 AM   #21
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exactly.
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Old 07-15-2008, 07:40 AM   #22
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BTW Josh...did you get the gifts I left in the back of the truck?
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Old 07-15-2008, 07:49 AM   #23
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Yes, but you didnt take the battery core..

Call me when you have a minute.
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Old 07-15-2008, 08:12 AM   #24
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I didnt see it? Maybe Im blind...
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