Fuel Pressure on a 1987 5.0 SO August 09, 2010, 08:58:36 PM If one were to test the fuel pressure on a 1987 Thunderbird 5.0 SO, at the little nipple valve on the fuel rail, what should it be? I tested it with the car running. I'm trying to figure out if i'm not getting enough fuel into the injectors, hence the injector clicking noise. And I did get a code relating to a fuel pump problem.Anyone know? I tried looking in the book, but I didn't seem to find it. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #1 – August 09, 2010, 11:27:33 PM Maybe you should ask a mechanic, You seriously got a lot of ??'s, How messed up are you making that car? All the ??'s you asked were answered , try searching a little harder. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #2 – August 09, 2010, 11:48:04 PM It should be close to 39psi Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #3 – August 10, 2010, 10:21:31 AM 39-43 psi with the vac line to the FPR disconnectedthe roller over reset switch can also go semi-bad and that will in turn cause a low voltage to the fuel pump, and that will give low fuel pressure Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #4 – August 10, 2010, 04:43:44 PM Quote from: Kitz Kat;331342Maybe you should ask a mechanic, You seriously got a lot of ??'s, How messed up are you making that car? All the ??'s you asked were answered , try searching a little harder.What do you mean all the questions I asked were answered? I'm not messing up the car, I'm trying to fix it. They aren't worth a whole heck of a lot mint, so its not worth taking it to a shop and getting a $500 bill if I can ask a few questions here, make a few friends, and learn to work on my own car. My 1972 Cutlass 442, I don't have to ask how to fix it, there are no sensors, check engine lights, everything is mechanical and one can see how it works. Although, that is probably why I never have a problem with that car.Thanks for the replies though guys. If I'm getting 41ish, with the Fuel pressure regulator plugged in, is that normal? Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #5 – August 10, 2010, 08:40:04 PM Should be 39-41psi with the vac line disconnected and 30-33psi with vac, BUT a extra few psi of pressure will not cause the injector(s) to click, neither will low pressure... To determine if it is a injector, disconnect each one's electrical connector(one at a time) and running the engine with it disconnected... It'll skip just as if a plug wire is off but won't hurt anything... Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #6 – August 10, 2010, 10:12:15 PM Quote from: jpc647;331385What do you mean all the questions I asked were answered? I'm not messing up the car, I'm trying to fix it. They aren't worth a whole heck of a lot mint, so its not worth taking it to a shop and getting a $500 bill if I can ask a few questions here, make a few friends, and learn to work on my own car. My 1972 Cutlass 442, I don't have to ask how to fix it, there are no sensors, check engine lights, everything is mechanical and one can see how it works. Although, that is probably why I never have a problem with that car.Thanks for the replies though guys. If I'm getting 41ish, with the Fuel pressure regulator plugged in, is that normal?Okay I get it, the 40 year old car is easy to fix but the 22 year old car isn't. Pick up this book: http://www.amazon.com/Ford-Racing-M1832Z1-Electronic-Injection/dp/0837603013/ref=sr_1_1?ie=UTF8&s=books&qid=1281492197&sr=8-1I read it about 15 years ago and after reading it (makes a good bathroom book) you will understand what all the sensors do, why they do it, EEC-IV error codes, and what tests will help you diagnose your problems.In the meantime the search feature works great here. After searching and your at wits end than post a question. Thats all, I search stuff on this board at least 2 times a week and I've been messing with the same car for 15 years. Yesterday I wanted to know what size tire I could run on a 15x8 weld draglite and all I had to do was plug it in the search and my question was answered like 3 years ago and I even found pics of what it would look like. Now I could have had started a new thread and asked someone to take a picture of there wheels and post it but why? It was already asked and posted I just had to find it. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #7 – August 11, 2010, 08:43:53 AM Quote from: Bob;331411In the meantime the search feature works great here. After searching and your at wits end than post a question. Thats all, I search stuff on this board at least 2 times a week and I've been messing with the same car for 15 years. Yesterday I wanted to know what size tire I could run on a 15x8 weld draglite and all I had to do was plug it in the search and my question was answered like 3 years ago and I even found pics of what it would look like. Now I could have had started a new thread and asked someone to take a picture of there wheels and post it but why? It was already asked and posted I just had to find it.Let me ask then. What did you type into the search bar to bring up exactly what you are looking for? Maybe my wording and so forth wasn't close. But my fuel pressure search pulled up all kinds of threads, but nothing close to what I was looking for. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #8 – August 11, 2010, 09:05:53 AM I'm not sure what your trying to do, if your trying to test fuel pressure because of one injector that clicks (they always make a clicking sound btw) than your barking up the wrong tree. From my experiences fuel pressure will effect all the injectors not just one. If it was my car I would clear all my codes, drive it briefly and do the engine running test and a cylinder balance test and than take that data and look for a fix. If you don't know what those tests are than either read your scan tool book, buy that ford fuel injection book i recommended, search this forum, or google search it. Write down all your codes and use the links provided to you in the other thread and see what codes could possibly be related and handle each one, one by one... till you have no codes. Than if your car still runs funny its more than likely a mechanical problem I would think. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #9 – August 11, 2010, 09:48:59 AM Yes, I was trying to test fuel pressure, to see if maybe there was a fluctuation in it, leading to the injector click. One, possibly two injectors are clicking all of a sudden. The clicking started after I changed the intake gasket, I don't understand why, the injectors weren't removed from the intake. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #10 – August 11, 2010, 07:50:34 PM Sounds like your pressure is fine. How are you sure it is injector noise and not a rocker arm or exhaust leak tick....etc?Just thinking out loud. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #11 – August 12, 2010, 10:11:13 AM Quote from: mcb82gt;331522Sounds like your pressure is fine. How are you sure it is injector noise and not a rocker arm or exhaust leak tick....etc?Just thinking out loud.I thought about the rocker arm possibility. My thought on that though, is it only does it when there is a load on the car, and it will never do it in park or neutral no matter how high the rpms go. Wouldn't a rocker arm make noise regardless? Secondly, its not exhaust related, I've checked and rechecked the system. Nothing on the exhaust was touched when I did the intake swap. It started after that. Knowing that the pressure is fine, it takes one more thing off the table. Trying to narrow it down here. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #12 – August 12, 2010, 08:36:12 PM Are you sure the timing is correct and you're not hearing spark knock??? Rockers are going to make the same noise regardless of load on engine... Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #13 – August 14, 2010, 04:07:33 PM And if you play with timing, make sure you unplug the SPOUT connector, otherwise it'll be way off. Quote Selected
Fuel Pressure on a 1987 5.0 SO Reply #14 – August 14, 2010, 07:43:33 PM Quote from: TurboCoupe50;331642Are you sure the timing is correct and you're not hearing spark knock??? Rockers are going to make the same noise regardless of load on engine...At this point I swear it has to be spark knock...... Quote Selected
Topic: Fuel Pressure on a 1987 5.0 SO (Read 2508 times)
previous topic - next topic
