TPI swap - VATS problem?
#1
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Car: 1989 Formula Firebird
Engine: Swapped 350 TPI speed density
Transmission: 700R4
Axle/Gears: 2.73 (soon to be 3.42)
TPI swap - VATS problem?
Swapped a 91 Z28 5.7 TPI into a 89 Firebird (was 5.0 Throttle Body). Car ran before swap. Now, getting nothing when turning key.
Details of swap:
Or, is it possible it's something else entirely?
Working on it now, so any advice ASAP would be greatly appreciated!
Details of swap:
- Swapped entire engine, ECM, & harness (spiced into TBI firewall connector below brake booster).
- Both cars were 700R4 trans.
- Most accessories work after swap, including fuel pump prime @ key on.
- Re-rested key to verify VATS resistor is good.
Or, is it possible it's something else entirely?
Working on it now, so any advice ASAP would be greatly appreciated!
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: TPI swap - VATS problem?
Module under dash reads the key ; operates the starter enable relay and sends a signal to the ECM to pulse the injectors
Have you got power on starter circuit out of the Ign switch , the starter relay ?
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Car: 1989 Formula Firebird
Engine: Swapped 350 TPI speed density
Transmission: 700R4
Axle/Gears: 2.73 (soon to be 3.42)
Re: TPI swap - VATS problem?
https://www.thirdgen.org/vats_passkey_system
Module under dash reads the key ; operates the starter enable relay and sends a signal to the ECM to pulse the injectors
Module under dash reads the key ; operates the starter enable relay and sends a signal to the ECM to pulse the injectors
Thank you, Oz!So what you're saying is that I can change ECMs all day and they will all work with my key, provided I don't change the VATS decoder module under the dash, right? Is there a way to see with a multi-meter that I'm getting some type of signal from the VATS blue wire at the ECM?
Have you got power on starter circuit out of the Ign switch , the starter relay ?
Any suggestions on the connector that goes from the giant harness & ECM plugs to the one under the dash by the VSS Buffer (white, double, lettered A-R, but skips i, o, & q). I traced the wires on both harnesses and created my own pinout. There were a couple differences and 2 wires that the car wasn't "expecting to see".
One other quick question: I've been looking & searching to see if I need to repin the ALDL due to the swap. My friend (a licensed mechanic) used his scanner to try and read the codes (if any), but it wouldn't recognize the ALDL. This wasn't a Autozone economy scanner, but a $1,000+ real scanner from a mechanic's tool company. I thought I saw something once on TGO about it but can't find anything now.
Last edited by 1991_RS; 07-02-2012 at 07:32 AM.
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Re: TPI swap - VATS problem?
If your using the 1227730 ECM it will expect to see a 4k ppm form the vss directly. The tbi used a 2k signal to the buffer. Two was too correct this. One get a new 4k vss and rewire and use the 730 internal buffer or reprogram the tpi Memcal and use the buffer optical signal and use b10 of the ecm. The vats signal from the pass key ont the blue wire is 30hz 50-60%.
dont expect too see much if you are using a mt2500 or a paperclip with out the engine running.
dont expect too see much if you are using a mt2500 or a paperclip with out the engine running.
Last edited by Tuned Performance; 07-02-2012 at 11:03 AM.
#6
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Re: TPI swap - VATS problem?
acdelco 213-197 or standard motor products sc12. You might want to double check the numbers but it looks like thats the 700r4 4,000 pulse per mile sensor.
http://www.ebay.com/itm/SC12-Speed-S...ce1d31&vxp=mtr
http://www.ebay.com/itm/SC12-Speed-S...ce1d31&vxp=mtr
Last edited by Tuned Performance; 07-10-2012 at 05:25 PM. Reason: wrong post
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