You'll probably find it in the TPS wiring. What you're describing is decel fuel cut-off. Still getting an idle signal from tps as rpm goes over decel cut value.
Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com orders 1-800-FLY-MX5S Before you call our tech line (970.464.5600) please check out the FAQ <http://www.flyinmiata.com/FAQ/> section of our website Don't miss Flyin' Miata's Open House! Aug 14-17, 2008 ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert McElwee Sent: Friday, July 04, 2008 6:32 AM To: Miata Power List Subject: strange bipes, ecu, tps, etc problem I installed a bipes/jrsc on a friends '91 the other day and he is having problems with it. I have not been able to look at the car due to my work schedule but this is the problem as he describes it: "The idle seems fine to me so I tried to drive it. As soon as you try to step on the gas she would immediately choke out, not stall but you could not get it over 2000 rpm's. Put it in neutral and try to hold the rpm's at 2000 she drops to almost 0 then up to 2000 rpm's but not over 2000. The engine is pulsating." It sounds like something is putting the car in "limp mode". The car ran very strong after the install. He drove it home and didn't touch it for 6 days. The bipes wiring harness wires were pretty brittle at the green connector (bipes side). The CAS IN/OUT wires were installed with quick disconnect bullet connectors and the other wires (+12V, GND, air temp/flow) were spliced in with butt connectors at the ECU (1 wire in and 2 wires out) My guess would be that either the air temp or air flow wires are not making contact with the ECU but I don't know what affect this would have. The CAS IN/OUT wires have been jumped over so the bipes is not sitting between these. The only other thing (other than vacuum tubing and the SC) we messed while installing the JRSC was the TPS harness (it now has one of the JR harness extentions in it) and the ISC harness. Anyone have an idea of where I can tell him to look? It will be three days before I can put my hands on the car for troubleshooting. -- Robert McElwee and Blue Flash "The 40 MPG Miata" www.lightweightmiata.com/mpg Lightweight Miata Forum: www.lightweightmiata.com/forum The Miata Trailer Project: www.lightweightmiata.com/trailer
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