Hey guys, I picked up a used series 2 PTU off of a forum member yesterday without any connectors or adaptor loom. My s1 was working fine but I figured I might as well do the swap. So today I went to a car dismantler and picked up some plugs for my s2 PTU. I took one off of an N14 Pulsar (6 pin) and one off of a V6 Magna (7 pin) as they both use the same type of connectors supposedly. Anyway, I had my step dad who's an electrician help cut the old s1 connectors off and wire the new connectors up for the s2 PTU. Everything was done properly following the wiring diagrams etc. and wires were crimped properly. The only problem is I'm getting vibration and low/hesitant revving up to 2,500rpm which I'm assuming is misfiring. I've been searching threads for hours trying to find out what could be the issue. I've checked the connectors and plugs to make sure that they're all clean. I've just disconnected the battery and will leave it for an hour or so to hopefully reset the ECU. It's a 1990 2+2 Aus Spec Auto if that makes any difference. I'd appreciate any body's opinion or help! Cheers, Tyler
In know if the black and the earth are mixed up it wont work and the PTU will get hot with the ignition turned on. but as you have a running engine allbeit a bit sad this is not likely to be your problem. my suggestion is to first ensure you have the wiring in the correct order. also check the plugs are nice and clean - free from green corrosion - also check each pin and socket are a snug fit, hard to do I know but the reality is if one pin is pushing back it can make a bad connection. from here I would be checking each cylinder is indeed firing an induction timing light will tell you if the pulse is getting to the coil but you will need to pull the coil pack and use a tester or earth a plug and turn the engine over to see actual spark.
Thanks for the quick reply! The wiring should be all fine as we went over the diagram numerous times and made sure each connection corresponds but you can never be too sure, I'll have a look again. I'll go check out the pins on the PTU now and try lightly pushing them to see if any are being pushed back easily. The plugs that I bought are clean inside so I don't see any issue there although the 7 pin connector has a light permanent texter mark going across one of the terminals which I just noticed now. If all else fails I'll have to find new plugs from somewhere and if that doesn't work, another PTU Thanks for the help!
pull off your coil pack connectors 1 by 1 to find out what ones are not firing. you will probably find you got the blue and green trace wires mixed did you use this as your reference?
Turns out there were two wires mixed up with eachother because they were the same colour. :bash: All sorted, thanks for the help!
Good to see you found it.... my intro to working on a Zed was a PTU install that had gone wrong. the guy I bought mine from had wired the 2 black ones the wrong way round, hence my earlier comment. in the end that was the least of his worries, 18 psi on stock injectors had also melted a piston and almost cooked a second one as well...... in the end I got a cheapish Z its up to a reasonable price overall for an average Z that needs a paint job but how many 20 yr old cars dont need that.
