Long Starting with EBL Flash and TunerPro software

I installed an ECM from EBL Flash and tuning with TunerPro software on my '94 K1500 P/U with a 350 TBI. I did not have this problem with my stock ECM and it started as soon as I switched.... I have to crank the engine for about 25-30 seconds when it is cold and when it is at operating temp it will not start at all. I have noticed that it starts as soon as the oil pressure shows just above the red line. Is there a way to tune out the oil pressure switch or is it a problem with the sensor? How would I go about fixing it? Thanks.

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Originally Posted by beast94

I installed an ECM from EBL Flash and tuning with TunerPro software on my '94 K1500 P/U with a 350 TBI. I did not have this problem with my stock ECM and it started as soon as I switched.... I have to crank the engine for about 25-30 seconds when it is cold and when it is at operating temp it will not start at all. I have noticed that it starts as soon as the oil pressure shows just above the red line. Is there a way to tune out the oil pressure switch or is it a problem with the sensor? How would I go about fixing it? Thanks.

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Seems weird that it would have started when you swapped PCM's but , check that the fuel pump relay is getting a "prime" siginal from the ECM .

The pump has two circuits that power it , one is a "prime" command from the ECM that the fuel pump relay gets before and during cranking , the other is via the OPSU (Oil pressure sending unit) , this actually runs the pump as long as the engine has oil pressure.

If the ECM is not commanding a "prime" before and during cranking the engine will not receive fuel pressure until the OPSU "sees" oil pressure and closes that part of the circuit.

HTH

TOM

What he said...

94? Does this have an Auto trans and the 2 ECM now? May be a wiring issue.

I was thinking it was a fuel prime issue so I replaced my fuel pump relay with no change. Is there a line item in the software for prime length? I can try that.

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Originally Posted by EagleMark

What he said...

94? Does this have an Auto trans and the 2 ECM now? May be a wiring issue.

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Yes, it has a 4L60E. I had to repin the Engine ECM and splice in the OEM ECM to run my transmission. I am going to be getting rid of the OEM ECM and replace it with an actual trans controler soon. I will double check my wire pinning and wiring.

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Originally Posted by beast94

I was thinking it was a fuel prime issue so I replaced my fuel pump relay with no change. Is there a line item in the software for prime length? I can try that.

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Is the EBL actually triggering the relay to activate during the "prime" and during cranking ?

I believe pin A1 is the fuel pump relay siginal wire on the EBL wiring , which siginals the relay to activate . I would check to be sure you have a siginal there first .

TOM

Ok, I will check that. It will be a couple weeks before I can do it. Im away from home right now. I will make sure to post back when I get a chance.

Ok, I got back yesterday and I will be getting my truck in a day or so. I will let you all know whats up when I get it. I saw a recent post about a similar issue, so I will be watching that one as well. Thanks everyone.

Ok, I checke the wiring to the relay and the ECM. Everything looks like it is wired correctly.

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Originally Posted by Nasty-Z

Seems weird that it would have started when you swapped PCM's but , check that the fuel pump relay is getting a "prime" siginal from the ECM .

The pump has two circuits that power it , one is a "prime" command from the ECM that the fuel pump relay gets before and during cranking , the other is via the OPSU (Oil pressure sending unit) , this actually runs the pump as long as the engine has oil pressure.

If the ECM is not commanding a "prime" before and during cranking the engine will not receive fuel pressure until the OPSU "sees" oil pressure and closes that part of the circuit.

HTH

TOM

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How do I check the tune for the the "prime command"

Ok, I talked to Bob at Dynamic EFI and he said that he thinks I have a faild component in the ECM for the priming. He recommended that I swap A1 over to F6 and that fixed my priming issue for now until I can send my ECM back to him for repair. I replaced my distributor, because I was going to do that anyway in about 2 weeks. That fixed my hard starting issue. Now it runs good. Its back to tuning for me! Thanks everyone for you help.

Glad you got er done! RBob and Dynamic EFI are excellent products and tech support, really rare to see anything not perfect to come from there, but stuff does happen.

I am having another issue now. I cannot update or program any banks. I have the key on and the WUD says that I am communicating with the ECM, but when I try to update or program any bank, it tells me it failed. The connectoins are good and everything and I can veiw data when the engine is running. What should I look at to fix it. Thanks

Usually when I have an issue like that with TunerPro I just close everything restart, reload and all is well. I've just never played with the Dynamic EFI so not sure on specifics there. does it need key on or engine running? I have an issue with my laptop that sometimes my left USB port works with TunerPro and sometimes my right USB port works with TunerPro and once I get the right one it's fine till I use something else in a USB port or restart the computer. I am told this is not possible with Windows 7 but it still happens to this day. Once both USB ports worked which is the way it is supposed to be?

I'd really like to help but you need to realize RBob/Dynamic EFI is very serious about his reputation of tech support and he'd be glad to help, I have never heard anyone say anything other then he was absolutely available and ready to assist!

Have you read some of the long threads at Thirdgen.org on EBL?

Ok, I will try restarting everything. I have had a good experience with Bob and Dynamic EFI. He has been more than helpful. I will email him about it if this does not fix it. I created a thridgen log in, but for some reason I wasnt able to get on it, I will try again. Is the EBL big there? Im having some tuning issues now too. Or some reason no matter what I do, it thinks I have a perminant knock and the KNK is peged to max. I am getting 15 degrees spark advance at idle, but when Im driving Im only seeing 8 degrees. That is not consistant with my SA main table. What should I look at to fix this? Also when it enters lean cruise mode it throws a trouble code, but when I open up the MALF codes, I do not see a code thrown by it. It is only when its in lean cruise (in 4th gear and above 40 MPH). When I let off the gas pedal the code goes away. I am going to be installing my WB sensor tomorrow. Thanks for you help.

You should not be using higway lean cruise until your tune is in order!

With the ECM seeing knock it is pulling timing. Do you here any ping or knock? Have you set the base timing on the distributor? Have you used a timing light to verify your timing in spark table is close to what is on timing marks? My advice is to not drive the car till you find out what this issue is, knock this bad if real can casue major damage!

Yes EBL is big on Thirdgen.org RBob has been hanging out there since before dirt, :laugh: that's why I pointed you that way.

Hope you get er worked out, always welcome back here to share. Right now you need to be careful till you get these issues in order.

I can not hear any pinging or knocking though. Thats whats confusing me. And if it is a huge problem with it, where should I look to fix it. I will disable leane cruise till I get it in order. Thanks

Well if there really is no ping and knock then you have an issue with the Knock sensor or ESC. Something is not right. It really scares me when I hear something like this as I am not there and this could be a very serious issue or just false knock? Do you know where timing is with a timing light?

I would really rather you talk with RBob as this is his design and he knows it inside out and upside down without even looking at a diagram. We have a joke that he is really a RBot! I have never used one... I am not chasing you away! I am giving you best advice!

I just emailed him about it. The base timing is set to 0 degrees at the distributor and the ECM. Thanks for you help.