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1993 VW Cabby with 1998 VW Jetta ABA swap

Old 04-04-2019, 12:01 PM
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Default 1993 VW Cabby with 1998 VW Jetta ABA swap

I have a 1993 MK1 Cabby who the previous owner almost completed the ABA swap. I was basically given the vehicle and have hardly any $$ into it yet. The motor came from a 1998 vw jetta. He spliced the obd2 wiring into the stock fuse box. The car was not running when I got it because of the fuel pump. I wired a separate fuel pump relay and used the obd2 ecu to provide ground to the fuel pump relay. Once I had it wired up correctly, the car now starts and runs. I wanted to make sure the pump stops working when the car stalls or engine is shut off which it does because of the way its wired to the ecu. So I will at least not burn to death in the event of an accident. Believe me I tried following this threads advice for the fuel pump but this works for me. With not being familiar with wiring before, I have gained a lot of knowledge reading the wiring diagrams from my Bentleys.

I need assistance with two issues:

1. When I rev the engine up to 2000 rpm, my oil light and my oil buzzer come on. I took an old VW mechanic's(Dave's Auto World out of Duncannon PA) advice and idled the car for 20 minutes and dumped the oil and trashed the oil filter. I installed a new oil pump. Then replaced the oil and filter. I hooked up a oil pressure gauge tester at the engine block (low pressure sensor) then at the oil filter (high pressure sensor). Both read roughly 5 bar(~70psi) when the engine is cold and similar when its idling for a while. Note that the wiring to the gauges in the center console are disconnected but the oil pressure gauge goes up to 5 bar which gives me some reason to be concerned.

Note: I am using 5w40 oil and authentic black vw oil filter

2. I had the car idling for roughly 20 minutes and went to check the gauge, then my arm grazed the upper coolant pipe and burned my forearm a bit. I checked the radiator fans by jumping the wires feeding at the bottom right of the radiator and they work. The radiator was not hot. Should I start by draining the coolant and replacing the thermostat? Then proceed to look for blockages

Note:I am running genuine VW Audi G13 red coolant at 50/50.

What is some troubleshooting I can do regarding these issues? I do have a Bentley for both the 1993 MK1 Cabby and 1998 jetta. I am thinking about running the oil pressure switch directly to the instrument cluster but not to sure if it will solve the buzzer being on after 2000 rpms.

I am wondering if both of these issues some how connected.

Thanks in advance

1991 VW Vanagon with ALH TDi conversion(NLS conversion)
2000 VW GTI VR6
2013 VW GLI

1976 VW superbeetle
1993 VW Cabby with ABA conversion
Old 04-05-2019, 09:53 AM
Keithuk's Avatar
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Join Date: Sep 2009
Location: Stoke on Trent, England
Posts: 2,218

The 1998 Jetta I can't tell you the correct oil pressure but I'm guessing its 2.0 bar (30 psi) @ 2000 rpm.

Your garage measured Both read roughly 5 bar(~70psi) which sounds high. A 2005 Jetta 2.0 FSI BLR 2.7-4.5 bar @ 2000 rpm

Manufacturer: VW, Date(s) Used: 03/1992-12/1998, Model: Jetta, Engine Code: ABA, 85Kw, 115PS, 2.0 Ltr, 4 Cyls, Remarks: California: Bosch Motronic M2.9

The oil pressure switch is a simple circuit easy to check out. The switch just earths out the cable which puts the light on. Check for any bad connections or cables that are shorting to earth.
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