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PROBLEM SOLVED! VE Just Installed, Car Starts, Runs for 2 seconds, Stumbles then Die
OK this is probably another dumb question but here we go...
I just finished installing my VE in my 1994 SE-R. The car ran perfectly with the stock engine. I swapped over the Maf, the Fuel Injector Harness, The IACV, the Distributer, and all of the other sensors from the DE so that the VE will work with the Stock Harness and the Stock ECU. I installed a new Fuel Filter as well. The car still has the VE Throttle body and the VE Injectors.
When I go to start the car the engine runs smooth as can be at 2000 RPM's, after 1-2 seconds it stumbles and then dies, as if it is running out of fuel. If I start it again it does the same thing. It starts imeadiatly every time. I tried adjusting the timing with the distributor but that doesn't help.
I have a new ECU from Calum but I don't want to install it yet, because the car should run with the Stock ECU, Correct? I figure it is better to track this down before switching out the computer. One thing at a time is better then throwing a bunch of things on it at once....
Is there a difference in fuel pressure for the VE, because if it is not getting a high enough fuel pressure then it could cause the stalling, right? It could also be the MAF, but I don't understand how it could go bad sitting in a box waiting to be installed.
Any other ideas? I will swap out the MAF with a spare one tommorow, and I have another ECU aside from the Calum one that I can try.
Any help would be greatly appreciated. I am hoping that it is something stupid that everyone runs into, that is easy to fix.
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1976 Ford Bronco (Restoration in progress)
2004 Infiniti G35 Sedan(Wifes Ride)
1994 Maroon SE-R ITA, Build in progress..
1994 Black SE-R SR20VE 196WHP (Sold)
1991 SE-R Turbo (Sold)
1991 Black SE-R (Sold)
1993 Red SE-R (Sold)
1992 White SE-R (Sold)
1997 Teal 200SX SE-R (Bought new in 1997... SOLD)
First off put the calum ECU. It should be fine. Did you run the pipe from under the iacv to the intake? That's why mine would not start initially. I had forgotten to hook that up.
It will run like a raped ape soon enough.
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1992 SE-R 'Fasty' Mods and more mods. Ready for more boost. Soon.
1992 NX 'Peggy' Intake, exhaust, suspension.
"We have always known that heedless self-interest was bad morals; we know now that it is bad economics" F.D.R. Second inaugural.
correct me if I'm wrong, but if he swapped the iacv from the de motor, it doesnt have that pipe that goes to the intake right? wouldn't he need to use the VE iacv?
^I think thats only if you swap the whole iacv-aac assembly. I just swapped the iacv so the connectors worked w/o any more splicing. Memory is a bit fuzzy. The fuel lines are another one to check.
i had this problem before, i found it was a vacuum line that goes from under the Intake manifold to the Intake Pipe, its a pretty fat line, once i hooked that up correctly, car idled like a baby. Take a look at all your vacuum lines, maybe you have one mixed up.
OK I switched MAF with another car and the problem persists.
I switched ECU's and the problem presists.
I checked all of the vacuum lines, they are all atached securly and they are run correctly to the best of my knowledege. I ran the one from the side of the intake after the MAF to the nipple on the intake manifold and I ran the one from the underside of the Intake to the IACV line under the throttle body.
Could a bad TPS Sensor cause the car to strat rev to 3000 RPM's as smooth as can be and then just turn off after 2 seconds? Does the VE need more fuel pressure then the DE? Could my Fuel pump be not up to the task. I don't want to throw parts at the problem if I can avoid it.
Is the ecu throwing any codes? Hook up the consult-on-board ecu with the correct maf/inj and check.
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All posts by Calum in this thread are copyrighted by Calum, and cannot be edited, deleted, or copied without his express permission. calum@calumsult.com
Fuel pump worked fine with the SR20DE in the car 3 weeks ago. I can't see how it would die randomly like that. I have another fuel pump somewhere, I will try it if changing out the tps doesn't fix the problem.
It could also be a faulty TPS and an incorrectly set base idle.
When you unplug the TPS and start the car it will run at 1500-2000 rpm for a couple seconds then the idle drops to the base idle. If the screw is turned in too much it will stall.
It may be worthwhile to check the TPS and its wiring.
What happens if you keep the throttle partly open on starting?
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I started out with nothing and still have most of it left.
- check the fuel lines to make sure they are not reversed - local guy reversed the supply and return fuel line - would run for a couple sec then die, and would start right up again for a couple sec.
- also make sure you have the large (~1/2") vac line running from IACV-AAC to the intake after MAF before TB.
My turbo car did the same thing, was missing the large vac line.
See here: http://www.sr20forum.com/showthread....ighlight=turbo
OK I put in the Calum ECU. The car now starts revs to 2000 RPMs and imediatly turns off. I put the ECU in Diagnostic mode and it gave me 5 Dashes and 5 quick pulses which means that the system is functioning normally. Great... I suppose that eliminates the TPS Sensor...
I checked the fuel lines they are hooked up like this picture from Chriscar
I even tried switching them but the car doesn't start at all if I do that.
All of the vacum lines are where they should be. Here is how they are hooked up, the one that is not visible in the picture is hooked to the pipe under the Manifold that runs to the IACV Valve on top of the intake manifold by the fuel injectors.
I keep coming back to a lack of fuel pressure, it seems like the car is running out of gas. I will try a fuel pump tommow I think. Arghhh....
