ok i just got done putting my plenum back on and now the car idles rough and the tach for some reason at 2k rpms starts to read backward. All i did was take out the walls in front of the egr holes. WTF happened?

 

Make sure that when you hooked everything back up you didn't forget anything. There are several vaccuum hoses that are on the throttle boby and the plenum. And alsoi a few connectors for the TPS sensor and the IAC valve on the Throttle body. And the MAF sensor on the underside of the plenum. Double check EVERYTHING!

 

What other mods do you have. A lot of times, you may have just reached the point of needing a custom chip. I did heads/cam, lower end and a whole bunch of other stuff. it ran fine till I changed the intake/inj/tb. good luc

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SUPERCHARGED 87 GTA: Blk/Gld w/Superam, 355cid Trickflows, forged pistons 9.5:1. Auto 2,600 stall, 3.45 9 bolt disc, Best time & mph (Naturally Aspirated): 13.567 @ 101.900 w/ a poor 60ft. Best mph: 104.3 *This car is 100% NYS emissions legal, w/ all emissions controls!* "If you want to have a fast car, hang out w/ those who do!"
http:// www.community.webtv.net/munks87/JustinsGTApage.com
VORTECH S-TRIM, INSTALLATION IN PROGRESS: 10 & 15 LB> PULLEYS, CUSTOM HKS RACE BYPASS, CUSTOM DUCTING W/ COLD AIR, SWAPPING TO SERPENTINE, & MANY EXTRAS! BEST TIME: 11'S I GUESS. WE'LL SEE IN SPRING!

 

i have edelbrock runners base and 52mm tb,msd6a, headers,hypertech chip,cold air,gutted maf,and under drive pullys. i double checked everything. do i have to block off the egr holes or anything like that?

 

I don't want to sound mean, but some people give some crazy advice that makes things worse than they are. Justin, if the car was running good before, what makes you think that he needs a custom chip now? Wataru, obviously something happened, most likely you broke something or forgot to reconnect something or just so it happen that something decided to break right when you decide to port your plenum. If you double checked already, then triple check. If that does not work, then take it to someone who knows better for a complete system check up. Trust me, your problem is not ECM calibration. You barely have any mods and a chip wont fix the car.
Rick

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'88 GTA 350
Headers, catback, free mods, Xtreme energy cam, intake pieces and 2100 RPM TQ

13.39@102.50 MPH
1.90 Sec ------- Best 60FT
104.23 MPH -- Best Trap Speed
AIM HIGH!

 

.........a well designed chip, however, will probably lower your et.

 

thanks for the help guys. Trevor you were right i missed a couple of vaccume hoses i didnt see(must have been tired or something).
thx for the hlp.

 

You might have a vacuum leak at the runners. Use an unlit propane torch wander it around the gasket areas if everything else looks ok.

 

And if the vacuum hoses don't fix it, for some reason i had to disconnect my battery for 30 mins and then reconnect it. Sounds odd to me, but it worked, so you may wish to try that before you go tearing into bigger things...

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Problems every other day with the car (probably not a mod, but to me it sure makes a difference)