need help with an 85

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Apr 27, 2005 | 04:04 PM

srsjuju

Thread Starter

Melting Slicks

Joined: Apr 2003

Posts: 3,281

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From: Wood Dale Il.

need help with an 85

first problem, we did an engine rebuild on my dads 85 and now it is running realy rich, we put a little bigger cam in but nothing outragus any ideas on this one?

Also we put in roller rocker and at about 3500 rmp it falls on its face I read in an other thread it my be the knock sensor can you run the car without this sensor?
or any other ideas on this I am 99% sure the rockers are adjusted correctly

thanks

Rob

Apr 27, 2005 | 04:14 PM

B84RADR

Burning Brakes

Joined: Apr 2002

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From: Spanish Fork Utah

Are you running the stock chip for the ECM? How about your base timing?

Apr 27, 2005 | 04:18 PM

CentralCoaster

Team Owner

Joined: May 2002

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

The knock sensor may be killing your timing for good reason. It's not the first thing I'd disconnect.

Apr 28, 2005 | 04:07 PM

srsjuju

Thread Starter

Melting Slicks

Joined: Apr 2003

Posts: 3,281

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From: Wood Dale Il.

Quote:

Originally Posted by sspackman

Are you running the stock chip for the ECM? How about your base timing?

the base timing is set at 4 deg advance and it has a stage 4 chip in it

Apr 28, 2005 | 04:53 PM

CFI-EFI

Race Director

Joined: Sep 2000

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From: The Top of Utah

Are you getting any codes? Is everything hooked up? The first thing that comes fo mind is the engine coolant sensor. If it is defective or not connected, the ECM thinks the engine is dead cold and will command a rich, choke type, mixture. That could be the problem at 3500 rpms, too, especially if the plugs are starting to foul.

RACE ON!!!

Apr 28, 2005 | 05:23 PM

crheinish

Burning Brakes

Joined: Nov 2002

Posts: 1,239

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From: Las Vegas NV

With a stock tune TPI cars with an aftermarket cam run rich. For your other problem I bet your valve lash is to tight. If you are running oem lifters set them with the engine running at 1/2 turn past 0 lash when the engine is at normal operating temperature.