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#1
11-03-2004, 02:57 PM
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uncontrolled revving
My son and I just installed a short block in his '88 turbo. The good news is that after a bit of twiddling, it started. The baaad news is that it starts revving uncontrolably. (5k within a few seconds). I suspect the pressure regulator/PR solenoid. Can anybody suggest a check on these components or an alternative fix?
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#2
11-03-2004, 03:36 PM
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Re: uncontrolled revving
Quote:
- throttle cable, is it set right? - TPS, often fail, ~$50 new OEM or free from a junkyard - CAS, set right? - coolant seals. remove coolant cap and check for bubbles on cold start.
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-1987 Mazda FC3S TII - dynoed 316rwhp 06.28.04 S5/S6 SP motor w/ HKA T04R @ 14psi CP Racing 4point Roll Bar Cusco ZeroII Coilovers SSR Watanbes RS-8 17x8F:17x9R - 1993 Mazda FD3S Competition Yellow Mica R1 - 1991 Mitsubishi Galant VR4 - daily grind JDM EVO RS motor w/ EVOIII 16G turbo
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#3
11-03-2004, 03:55 PM
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Re: uncontrolled revving
Thanx, FCsilvia-
The throttle cable is in its default position and seems to operate smoothly. I assume that the TPS is the throttle position sensor, so that might be a good possibility to check. What is the CAS? RGM
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#4
11-03-2004, 04:41 PM
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Re: uncontrolled revving
CAS is crank angle sensor. Is the revving steady at 5000rpms? That really just sounds like a stuck throttle. Double check your cable and throttle body.
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#5
11-03-2004, 06:44 PM
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Re: uncontrolled revving
MBTN-
Thanks. The revving is not steady at 5k. I suspect it would go to redline if we didn't kill it. When making our first attemp to start it, I had to realign the CAS. Initially, it would not idle, then I rotated the CAS to its clockwise limit.
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#6
11-03-2004, 07:16 PM
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If it was TPS or CAS is it possible for it to remain a steady RPM at 5,000? If not then the throttle cable seems a likely cause...but im not sure...
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#7
11-03-2004, 08:55 PM
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Re: uncontrolled revving
+1 for TPS
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 1990 RX-7 Turbo II, Streetport, 62-1 Ball Bearing Turbo, FMIC, R.E. Amemiya exhaust, Haltech E6K, GReddy gauges, Apex-i AVC-R, and much much more  Under a complete Time Attack/Drift makeover 
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