2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Tips or injector

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Old Dec 4, 2014 | 04:55 PM
  #1  
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Tips or injector

The car : s4 with s5 intakes no emissions (main cat run without air for less than 150 miles) stock ports injectors and suspect junk bac

The problems : I stopped driving it because the ball joint had 1/4" of play . It was running mint at that time . Now since the ball joint I have sputtering above 4k . My first thought was plugs . Replaced , to no avail . The car only hesitates under load with wot . Half throttle not even a skip afrs stay 12s until 6k(great IMO , after 6 I'm hitting 13.1-13.5)
I have adjusted to 1k on my tps before it sat , for 2weeks . I replaced fuel filter and nothing improves . I was leaning towards injector fault before until I realized I can half throttle to 6k in most gears . I unplugged my tps and had no improvements or worse . Does this sound like secondary injectors or tps ? Thanks (sorry bout the long post)
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Old Dec 4, 2014 | 05:18 PM
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Did you grind the center iron down before installing the S5 manifold on the s4 keg?
Common for a vacuum leak to occur when you do this 'mod'.
The iron has a high spot.It may look like the manifold sits nice and pretty but it actually sits a little cockeyed and a vac leak occurs.
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Old Dec 4, 2014 | 05:27 PM
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Yes I've ran quite well on this mod for 2 months . Only after it sat do I have an issue (unrelated to my bac that is)
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Old Dec 4, 2014 | 05:37 PM
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I was under the impression that unplugging the tps would make the car drive terrible . However it doesn't make it better or worse . That does not mean the injectors are not bad though
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