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Posted by: falconfp2001 Mar 28 2011, 07:55 PM

I just got my FI back up and running but now I have a problem with the Throttle Body. My Butterfly has to much play now that I cleaned it and it sticks open just enough to make the idle surge.

I'm thinking I should get a stronger return spring but don't really know if that will solve the problem?

Any ideas?

thanks

Posted by: NJ914Guy Mar 28 2011, 10:16 PM

How are the throttle cable and the pedal bushings? Just replaced mine and made a world of difference.

Posted by: falconfp2001 Mar 28 2011, 10:25 PM

Forgot to mention, 1971 1.7L Stock FI.

Thanks

Posted by: detoxcowboy Mar 28 2011, 11:21 PM

at your flaps, there is a doubled throttle spring for ford that works and fits perfect, it will be hanging in the emergeny fix it isle, that might help you get it to fully close and after a while it may work itself out.. plus you have that extra spring if ever one breaks.. it was working before you cleaned it, sometimes when things are clean they tend to grab easy.. just 2 cents.. mine was the other way around it tended to stick closed after refurb. and now its fine.. I chose the double throttle spring when mine tired out and failed on the freeway, i like the throttle feel better with the extra tension..

Posted by: underthetire Mar 29 2011, 09:17 AM

First, did you disassemble the throttle body? If you did, you must make sure you put the butterfly plate on the correct direction. They had a slight taper around the edge to allow them to close all the way. If you flip it, the sharp edge will hang up a little in the bore.

Posted by: falconfp2001 Mar 29 2011, 01:11 PM

Found a Spring, that seems to have that extra umph.

Idles fine now but may need to replace the TS.

Doesn't accelerate smnooth from a stop and staying at steady speed tends to jerk instead of staying at a steady speed.

Anyone have this issue before?

I think it's the TS.

I have another one that I can refurbish or swap out to see if there is a difference.

thansk

Posted by: windforfun Mar 29 2011, 01:41 PM

QUOTE(falconfp2001 @ Mar 29 2011, 12:11 PM)

Found a Spring, that seems to have that extra umph.

Idles fine now but may need to replace the TS.

Doesn't accelerate smnooth from a stop and staying at steady speed tends to jerk instead of staying at a steady speed.

Anyone have this issue before?

I think it's the TS.

I have another one that I can refurbish or swap out to see if there is a difference.

thansk

Yep. BTDT.

How's the TPS (TS)? Is it positioned correctly? Is it worn out? Pop it's cover & look at the wiper(s) & copper traces.

Posted by: r_towle Mar 29 2011, 01:51 PM

did you disassemble it to clean it?

Rich

Posted by: falconfp2001 Mar 29 2011, 04:32 PM

No disassembly.

Just cleaned out the Air bleed inlet, advance and retard connections and the inside of the throat. tried to cleaned the edge of the butterfly as best I can. One Seems to have a small groove in the throat where the butterfly rests. Going to try and polish that out a little but if I can get a Throttle that works fine with just a little cleaning then I'm golden.

Posted by: zonedoubt Mar 29 2011, 04:55 PM

If you're so inclined take it apart to clean it. It's not too complicated and will let you check the condition of the shaft and bearing surfaces.

I just did mine, read http://www.914world.com/bbs2/index.php?s=&showtopic=116762&view=findpost&p=1444564.

Posted by: falconfp2001 Mar 29 2011, 05:24 PM

QUOTE(zonedoubt @ Mar 29 2011, 03:55 PM)

If you're so inclined take it apart to clean it. It's not too complicated and will let you check the condition of the shaft and bearing surfaces.

I just did mine, read http://www.914world.com/bbs2/index.php?s=&showtopic=116762&view=findpost&p=1444564.

Small problem with the 1.7L, shaft does not disassemble like a 1.8 or 2.0. The return spring is attached to the rear Engine tin. They look close.

I don't think they are interchangeable though.

Posted by: falconfp2001 Mar 29 2011, 05:40 PM

Does anyone know if the Throttle body is different from a 1971 1.7L to a 1975 1.7L? it would be great if they improved the Return Spring Setup.

Posted by: dlee6204 Mar 29 2011, 05:43 PM

QUOTE

Does anyone know if the Throttle body is different from a 1971 1.7L to a 1975 1.7L

'75 cars didn't come with 1.7L engines.

Posted by: zonedoubt Mar 29 2011, 11:46 PM

The 1.8 also has the return spring fitted to rear tin.

QUOTE(falconfp2001 @ Mar 29 2011, 04:24 PM)