Espritv8black Posted October 29, 2021 Report Share Posted October 29, 2021 So, I wanted to show my V8 Esprit some love. She was jealous about the time I was spending with some other cars. Last year or was it longer ago.....well I replaced my coils and wires and injectors etc, and when the plenum was off updated some of the vacuum lines underneath. I replaced the clear line that attaches under the plenum to I believe the EVAP pump. It leaves under the plenum and is routed behind the drivers head in the engine compartment to a white check valve and then it disappears into the side compartment under where the carpet is. My line broke as soon as I handled it and I plugged the line. Well I finally got around to looking at it and took it apart and replaced all the lines, there are 3 separate lines, going to the charcoal cannister. All the lines were yellow and brittle from age, heat etc. When I drilled the rivets out (4) that were holding the Charcoal cannister cover on, the canister just fell to the ground ripping the lines off. I was a bit worried at first with which line went to which port, but it turns out they are all different sizes, so I was able to figure it out and the cannister itself is marked which line is which. It took me a few days to do the repair working on it 4-5 hours a day, probably longer than most and I did not have to pull the plenum as I already had a new line attached previously. Access to the side panel is well tight, you really need to lay on top of the engine basically to get at each fitting. What I can say is that I think the car now runs smoother at idle and also less spitting etc. I think I might have had some excess fuel in the exhaust or the system as a result of the system not working correctly. I will post some picture of the repair but may be able to answer any questions for anyone looking to do this repair. I did a almost 30 minute video on the repair on a new Youtube channel on mine detailing the repair. You might find it a bit humerous, but I think it is an operation that can be learned how to fix it from the video. Here is a link to the video of the repair. Quote Link to comment Share on other sites More sharing options...
cweeden Posted October 29, 2021 Report Share Posted October 29, 2021 I've not watched it yet but thanks for sharing, all maintenance info shared is very valuable when the time comes to tackle the same job. 👍 cheers -Chris Quote Link to comment Share on other sites More sharing options...
Espritv8black Posted October 30, 2021 Author Report Share Posted October 30, 2021 Chris, Thanks it was actually a bit more work than I thought it would be, but I guess I didn't really understand how it was impacting the drivability of my car. My car seemed to run strong before and I liked the raspy ness of the idle, but once done I think it was smoother and just ran better. Quote Link to comment Share on other sites More sharing options...
Espritv8black Posted October 31, 2021 Author Report Share Posted October 31, 2021 I had my car out today for a longer drive after doing the replacement of all the EVAP lines and all lines going to the charcoal canister and I can tell you that it hasn't run so good as it does now. It use to pop a bit after letting off the gas and it would spit a bit and occasionally backfire after letting off the gas. It sounded kind of cool, but occasionally I would get a really big back fire. It has never run this smooth. What a pleasure. Needless to say if the line has not been replaced going under the plenum then this repair would have been much harder and time consuming. I would definitely recommend if you are pulling the plenum off for coils or wires or injectors to replace at the same time at a minimum the line from the EVAP pump up to the check valve. This was definitely worth the work. Quote Link to comment Share on other sites More sharing options...
cweeden Posted November 1, 2021 Report Share Posted November 1, 2021 It's always nice when the work is rewarded with some obvious improvements. 👍 Quote Link to comment Share on other sites More sharing options...
Espritv8black Posted November 1, 2021 Author Report Share Posted November 1, 2021 Now I need to figure out why my speedometer works....occasionally. Vehicle Speed Sensor (VSS) was replaced and made no difference. Seems like a loose connection as sometimes when I hit bumps it comes on and then........later it just stops. It is in the right rear wheel in my 98. I tend to think it is a loose connection. I would be stoked to fix this issue. Electricity is not my strong point though other than putting in a new light bulb at home!!!!!! Quote Link to comment Share on other sites More sharing options...
sailorbob Posted November 1, 2021 Report Share Posted November 1, 2021 The speedometer gets its signal form the ECU (pin 60). Use an OBD-II scanner to check if the ECU is consistently showing the vehicle speed to narrow down the fault finding to the wiring before or after the ECU. Quote Link to comment Share on other sites More sharing options...
Espritv8black Posted November 1, 2021 Author Report Share Posted November 1, 2021 Awesome, I have a older, but really pretty nice OBD II scanner. I think today will be the day. So i assume that my OBD-II scanner ....once I find the data stream that shows speed, if it is showing a speed all the time will then as you say indicate that the issue for example is after the ECU. I know that the signal also goes to the ABS. Do you know if it goes to the ABS before the ECU or after the ECU? Thanks Mark Quote Link to comment Share on other sites More sharing options...
sailorbob Posted November 1, 2021 Report Share Posted November 1, 2021 The ECU gets the vehicle speed signal from the ABS ECU (ABS ECU pin 3 --> engine management ECU pin 75). Quote Link to comment Share on other sites More sharing options...
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