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Baja Forums -:- AzBaja.com Members -:- Projects and Builds -:- New project: ECOTEC!
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New project: ECOTEC!
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pepeazul
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 08:09 AM
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hmm, unfortunately, I have the 2.2 or we could plug my PCM in. I'd be happy to swing by tomorrow and put another set of eyes on it if you'd like. Did you google the obd2 code?

If you end up needing a local guy with experience, I can get you a name or you can ask Foddrill... I think everyone uses the same guy, but can't remember his name.
Chris

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Conundrum
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 05:01 PM
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Cool, at least you have a way of diagnosing.

I'm not sure how it knows the fuel pressure. It could be as simple as a switch (on/off) so you can connect the wires together and it thinks there's pressure?

Did you have a couple of extra wires that were not hooked up that go to the pump or oil sender?

I know a lot of cars, if there's no oil pressure, it won't turn on the fuel pump longer than the second or two for priming before cranking. Supposed to stop the Fuel from continuing to run on when the car gets wrecked and is a safety feature.


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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 05:25 PM
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pepeazul-I do have the 2.2-plugging in your ECM to my car may make it run. You are more than welcome to swing by today and see what i've got going on. Never know, maybe it's as simple as the vats not being disabled properly, that's the last thing my buddy and I narrowed it down to. Every single thing on the wire harness phil built for me plugs into something on the engine. We triple checked everything, and it all looks to be in order. Shoot me a PM if you want to come out to wittmann today and plug your ecm in. Mine is a 2008, not sure what year yours is.


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Ecotec 2.2 out of a 2008 cobalt. 4 seat sand cars unlimited. Swing axle trans.
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PaDan
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 05:52 PM
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On my 3.5 I have to run the fuel pump with the ecm. The ecm supplies 12 volts to the fuel pump relay to turn it on and off. You really should let it run the pump.

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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 06:09 PM
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How would I let the ECM run the fuel pump? The wire harness I had made up for me only had 3 wires to connect to something. One wire was ground, one was constant power, and the other was ignition/switched power.


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pepeazul
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Post Post subject: Re: New project: ECOTEC!
Posted: Sun Dec 16, 2012 09:36 PM
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Hmm, mine is an 05. It has the modular coil assembly and manual throttle body. I wonder if the PCM's would interchange. There is a picture of mine in one of the pics I posted a while back...

Anyhow, couple things crossed my mind.
1. you said if fired on either, which suggests to me that you have a fuel delivery issue. Do you know how much pressure you have to the fuel rail?

2. Any chance you using a key switch? The cheap switches that they sell at Checker, etc are notoriously flaky. I just remembered that i had an issue with my switch. You may want to verify that your constant power and your switched power to the harness are working properly.

Chris

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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 11:14 PM
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I am using a toggle with on/off and spring loaded start. There is a ton of fuel pressure on the rail. I am using a fuel pressure regulator that phil recommended for the corvette. The injectors just will not fire.


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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Sun Dec 16, 2012 11:15 PM
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I am using a toggle with on/off and spring loaded start. There is a ton of fuel pressure on the rail. I am using a fuel pressure regulator that phil recommended for the corvette. The injectors just will not fire.


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1engineer
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Post Post subject: New project: ECOTEC!
Posted: Mon Dec 17, 2012 05:04 AM
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cycleguy1979 the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad or connected/programmed wrong if you are also loosing spark when you loose injector pulse your pick up is causing the problem. Your fuel pressure after the regulator should be 52+psi. Vats system would block cranking/starting as well but does not sound like that is your issue here. Ray


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pepeazul
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Post Post subject: Re: New project: ECOTEC!
Posted: Mon Dec 17, 2012 06:33 AM
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There is no distributor, but a bad connection/problem with the crank trigger maybe??

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1engineer
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Post Post subject: New project: ECOTEC!
Posted: Mon Dec 17, 2012 08:52 AM
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Right, older models used distributor, then pickup was moved the to crank with a 7 point pickup, then the newest with 58 pickups (industry standard now). They do the same thing, just different location. And the ECU/PCM picked up the workload of the separate ignition module. Using starting fluid to run the engine a couple of times for 10 - 15 seconds rules out timing & electrical. Be aware if testing the injectors that there is a steady hot current with key on and that the PCM pulses the ground and not the hot side of the circuit. More of a German VW type circuit than a normal American standard for what old timers would expect. if memory serves, fuel injector electrical testing should be done with a 'noid' light as some normal test lights will damage the injector drivers (PCM), but don't remember if the newer systems are more vulnerable or the older ones with a dedicated ignition module tied to distributor.


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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Mon Dec 17, 2012 03:41 PM
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I'm gonna call phil again today to see if I can get in touch with him. I'm sure he could clear up this problem, if he will answer the phone.


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Conundrum
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Post Post subject: New project: ECOTEC!
Posted: Tue Dec 18, 2012 12:16 AM
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I hope you got a hold of him as you have me stumped... Hey no jokes. LOL


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cycleguy1979
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Post Post subject: New project: ECOTEC!
Posted: Tue Dec 18, 2012 04:56 AM
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Ok here's today's update. I called phil this morning and got in touch with him, he has been really busy. I told him what's going on, and he says he definitely had the VATS completely disabled in the computer, so that wouldn't be the problem. Then, we went through the wiring questions, everything sounded right to him. He asked me what kind of fuel pump I was using, and I told him it's a walbro inline that I took off my 2332 VW. He says "that's you problem"...Apparently, being fuel injected, the regular carbureted fuel pumps only put out about 15psi, and this thing requires 58psi. He says there wouldn't have been near enough fuel pressure to open the fuel injectors. So he told me to go get a E2000 pump at any parts house, it will work great. Also, told me I can't use regular fuel line or it will blow up to the size of a garden hose. So I picked up the new pump and hose and installed it this evening. I was certain this was the problem and that it would fire right up. Nope, didn't exactly fire right up. I pulled the intake elbow off and poured some fuel into it while my wife cranked it. About 8oz of fuel later(drizzling it in to keep it running), the thing started running all on it's own!!!! I'm so happy I don't know what to do with myself. This has been a long time coming. All I have left before I can leave it running for longer than 30 seconds is to button up the coolant lines and fill the radiator, then it can run and I can make sure everything is working properly.


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pepeazul
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Post Post subject: Re: New project: ECOTEC!
Posted: Tue Dec 18, 2012 05:12 AM
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Glad to hear you got it figured.

You might want to check for a large 3/4 inch diameter rubber hose that comes out below the throttle body, pointing towards the bellhousing. Not sure if all these motors have it, but mine did, and at first I was thinking crankcase breather until I realized it was actually vacuum for a brake booster. Plugging it off of course had a huge impact on how well the motor ran.

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