intake manifold spacer

[mrjoseloza88]

So I have a one inch throttle body spacer put on a while back and it did slightly increase throttle responce and low end torque. Well i was bored and made a custom intake manifold spacer... yes i stuck with an inch. I put it on and place a adapter plate to match the egr ports for the one inch of travel, and metal shims to keep the ignition module grounded to the block. Now the trouble comes when I run the car, in park it stay runnin somewhat smoothly, but in drive it wants to die if it goes below 1500rpm, 1200rpm when warmed up, top end improved but it takes a minute for the ecu to read more air to dump more fuel. I have a crappy a/f ratio gauge that travels from lean to rich, when driving it leans out, and stays leaned out about 90% of the time, do i need to tune it again or is it just to big of a spacer, or should i just take it off.

[pocket-rocket]

You will normally get a swinging motion on an a/f gauge. It's the nature of closed loop operation as the computer is constantly making adjustments. I've seen them drop off the scale on the lean side during cruising, too.

In all honesty I wouldn't rely on one that is not connected to a wideband, and if the idle issues started after the second spacer I would take it back off.

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[mrjoseloza88]

yea thats what I ended up doing I took it off and the car runs normal now, It looked really cool when I had it on the motor looked more beasty

[1988GTU]

You may have a vacuum leak. Make sure the surfaces for said spacer are flat, free from cracks, gaskets are intact and that you looked everything back up accordingly.