I got my engine all put back together with my new LT4 Hot Cam, and the car stalls and just can't hold idle. The car does however need have leaks at plenum to runner seals and the TB to plenum seals, you can hear the air rushing through so its a very severe leak. When I get this fixed it should fix the problem, right?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

if you fixed the leaks you'd off to a hell of a good start on fixing your other problems

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ICON Motorsports

1st & 3rd

 

Thanks, anyone else?

 

Definitely fix those vacuum leaks first. Cars don't like them. If there is still a problem after that, check to make sure that you installed your distributor correctly. You could be a tooth or two off.

 

BTT

 

make sure you didn't put the runners on the wrong side!!

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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'

 

In regards to your other post what did you find was keeping it from starting in the first place?

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

The original problem was that the distributor was 180* off. But you guys think those gaskets will fix it?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

It help me to get mine on the road Wensday. I didnt have alll the bolts torqued right. After that I'm on the road with a much happier car. Also make sure you have all of your vacuim hoses back where they go.

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87 Z28 305 TPI, Auto, LT-1 cam (peanut is history), roller timing set, 2.73, Gutted air boxes, K & N fillters, Dyno Max 3" cat back, 8.8 mm spirals, rapid fires, and 170* Stat.
Old Best 15.414 @ 87.47.

 

Dan, not trying to be a smart aleck here, but that's kinda like asking "If I patch that hole in my tire, you think it will keep it from going flat?"

 

LOL, you're funny Mike, but thanks, I guess the engine can barely get any air and thus it runs poorly, I mean, VERY poorly!!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

Actually, Dan, it's just the opposite. A vacuum leak introduces air into the engine that has not been measured by the MAF and so the proper amount of fuel hasn't been added.

You'd really be surprised at how a very tiny leak will play havoc with the idle of a TPI engine.

I had a very small one not long go that took me a week to track down (injector "O" ring) and before I found the cause, my engine wouldn't idle at all witout me taking the IAC out of the picture.

I had to crank up the "park" idle speed to 1000/1100, just to keep the engine running in gear at 800. Stalled at stop lights and was not only a royal PIA, but embarrassing too.

Before you start throwing parts at the problem, make sure it's sealed tightly.

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

[This message has been edited by JakeJr (edited February 24, 2001).]

 

Well, Kevin91Z discovered he also needs an eprom. You'll probably find the same thing.

 

Heh, Glenn thought the same thing i did. I wouldn't doubt that you may be able to get it to idle after the leaks get fixed but your probably looking at a new prom. Gotta admit, your mods are getting up there and only so much can be changed before something starts screwin up

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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)