The ECU has 4 ground pins and all 4 need to be grounded (2 to the engine, 2 to the chassis). Also double-check that the battery is properly grounded to both the chassis and the PPF because if it's not the ECU's grounds will be effectively disconnected. ----- Original Message ----- From: Henry R. Payne To: 'Ray' ; 'Bill Cardell' ; 'Jerry Malsam' ; [email protected] Sent: Monday, November 22, 2010 5:48 AM Subject: RE: It's ALIVE (sort of)
The system was working earlier, no fuel pump bypass has been done. On that note, even if the pump cycles up and turns off, the purpose is to pressurize the system. Therefore it would seem that even if the pump is off, an open injector will bleed fuel into the motor until the pressure was relieved. In this case, the pump had to be on, or at least cycle, as the amount of fuel (the intake manifold was literally full of gas as was cylinder 3) was over a gallon, as Jerry had noted earlier. At this point, looking at getting into the Link which hasn't cooperated and checking ecu grounds. The box has been in and out of the car several times and something may have been left off. On the earlier problem, for which Bill suggested the * on the idle. Couldn't see what was actually there since neither keypad or PC connection was working, so we presumed the * was present, and went directly to adjusting the TPS, which solved the fuel cut off idle issue. Really good tip. To answer Ray's earlier question, we have not been able to do any datalogging at this time. Bill, on a different note altogether, one of our race cars is a 95 1.8 NA with a mild blue print assembly -engine built for SCCA ITA rules. Ongoing discussion as to what AFR produces best power. This car has a DIY MegaSquirt. A corollary to this, is what EGT's should we see with a properly tuned engine? Thanks for the help. Henry Henry R. Payne Sports Cars Etc 7009 Hwy 29 North Pelzer, SC 29669 [email protected] (864) 947-9989 - Shop (864) 947.9392 - FAX From: Ray [mailto:[email protected]] Sent: Saturday, November 20, 2010 7:28 PM To: Bill Cardell; Jerry Malsam; [email protected] Cc: [email protected] Subject: Re: It's ALIVE (sort of) It sounds like the fuel pump control has been bypassed to keep the pump running whenever the key is on. Normally all Link ECUs kill the fuel pump after 2-3 seconds of the engine not running (same as the OEM ECU). ----- Original Message ----- From: Bill Cardell To: Jerry Malsam ; [email protected] Cc: [email protected] Sent: Saturday, November 20, 2010 1:22 PM Subject: RE: It's ALIVE (sort of) Loss of the ecu signal ground will cause the injectors to stay open, IIRC. Bill Cardell TurboDog's Dad Flyin' Miata 1-800-359-6967 (sales) 970-464-5600 (tech support) www.flyinmiata.com www.fmwestfield.com ---------------------------------------------------------------------------- From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Malsam Sent: Saturday, November 20, 2010 1:27 PM To: [email protected] Cc: [email protected] Subject: Re: It's ALIVE (sort of) Bill had it -- the TPS needed adjustment, per the FM2 manual. Solved that problem. Got a stickier problem now, and my Google fu is failing, but I was pretty sure this had been discussed: Since the Link was tuned for 550cc injectors, and the car is now running stock '99 injectors, the engine falls flat on its face at WOT, so I hooked up a laptop to retune fuel. The ignition was in the ON position for a few minutes to supply power to the ECU while I messed with laptop's COM ports, trying to connect. Then I heard liquid dripping onto the concrete from the engine bay. For some reason the injectors had stuck open and the powered fuel pump had filled the cylinders and intake with fuel -- gas was dripping out the air filter! So we got all the fuel (about a gallon!) drained out from places it shouldn't be, and the engine should be safe in that regard, but why would the injectors stick open? I hadn't changed any ECU settings, and the car has been left ON previously without incident. (FWIW, we're putting the RC 550cc injectors back in; I'm thinking the car should run okay on them without much of any retuning since we're staying boost-free for a while.) On Wed, Nov 17, 2010 at 7:47 PM, Ray <[email protected]> wrote: If that doesn't do it, can you collect datalogs? ----- Original Message ----- From: Bill Cardell To: Jerry Malsam ; [email protected] Cc: [email protected] Sent: Wednesday, November 17, 2010 11:05 AM Subject: RE: It's ALIVE (sort of) Check your idle switch setting. Asterisk in the idle window should be on at idle, should go away as soon as you touch the throttle. My guess is the switch is still closed when you have the throttle slightly opened. Bill Cardell TurboDog's Dad Flyin' Miata 1-800-359-6967 (sales) 970-464-5600 (tech support) www.flyinmiata.com www.fmwestfield.com -------------------------------------------------------------------------- From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Malsam Sent: Wednesday, November 17, 2010 9:28 AM To: [email protected] Cc: [email protected] Subject: It's ALIVE (sort of) My project Miata is running, though not yet in it's full glory. We're running it normally aspirated for the first 500 miles just to break in the motor before strapping on the turbo. We're having some problems with an apparent fuel-cut under part-throttle, low load conditions. The cut-out cycles about once per second. No stumble, no missing, just a clean cutoff, then as rpm drops it comes back on. The WBO2 gauge shows full lean when this happens. (WBO2 not connected to the Link ECU at this point.) The current setup is a built '97 bottom end with a '99 head, running stock injectors, naturally aspirated for now. ECU is a Link from a year 2000-era FM2 kit, using a MAP sensor. Any ideas as to what could be causing this fuel cut? Doesn't sound like a fuel pressure issue. I can't think of anything within the Link that would cut fuel like that. I'll have some time to play with it this weekend (I'm out of town until Friday), but for now I'd like to give my mechanic (Henry Payne, CCed) some things to check. Thanks, guys! --Jerry -------------------------------------------------------------------------- _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower -- Jerry Malsam Legend Consulting mobile: 864-386-1130 e-mail: [email protected] ---------------------------------------------------------------------------- _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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