Boost Problem? '90 SE
Discussion
Calvin: You say you have a flow chart for the vac lines. Do you mean that you have diagram? If so, Is there a way you could get that to me? I supposedly have the complete shop manual (Service Notes) for Esprit 1989 to 1992, but I couldn't find such a diagram. If your diagram comes from the shop manual, what page is it on? Maybe it's there, and I just haven't been able to find it.
My e-mail is walter.c.deane@usace.army.mil
Thanks. Walt
My e-mail is walter.c.deane@usace.army.mil
Thanks. Walt
Walt,
It is correct that the flow chart is not included in the manual labeled 88-92 Service Notes. You have only one book out of 2 that most people require to be able to work on the Esprit. If one knew everything about the Esprit build process and the parts used one might be able to use only the 1st manual called the 88-92 Service Notes. There is a second book for the car called the 88-92 Parts List. It shows exploded diagrams of all sections of the Esprit, electrical schematics, the parts used to construct the car down to the screw and clips. Also included are the Lotus part numbers for the items. It seems that the books were intended to be used together. The troubleshooting and repair is very easy to follow when the books are used in pairs. I will try and get access to a scanner to scan the page and send it to you. The book is very detailed with diagrams for each model and country covering the years. So there are at least 4 Vac line flow charts for the 88-92 years. What would help is the MY and VIN number for your car as sometimes there are changes in the parts list even within the MY.
Calvin 90 SE
It is correct that the flow chart is not included in the manual labeled 88-92 Service Notes. You have only one book out of 2 that most people require to be able to work on the Esprit. If one knew everything about the Esprit build process and the parts used one might be able to use only the 1st manual called the 88-92 Service Notes. There is a second book for the car called the 88-92 Parts List. It shows exploded diagrams of all sections of the Esprit, electrical schematics, the parts used to construct the car down to the screw and clips. Also included are the Lotus part numbers for the items. It seems that the books were intended to be used together. The troubleshooting and repair is very easy to follow when the books are used in pairs. I will try and get access to a scanner to scan the page and send it to you. The book is very detailed with diagrams for each model and country covering the years. So there are at least 4 Vac line flow charts for the 88-92 years. What would help is the MY and VIN number for your car as sometimes there are changes in the parts list even within the MY.
Calvin 90 SE
Calvin: Question. You mentioned in one of your earlier postings that I should check the vac line to the Fuel Pressure Regulator. I had done this, but I noticed something weird about this line. The vac line on the FPR goes directly to a "T" on the base of the intake manifold, which is fine. However, the other side of this "T" goes to the one-way valve on the crank case vent, which is basically open to the atmosphere. This didn't seem right to me, but that is the way I found it. Is this configuration correct?
Walt,
Sorry if I made a routing mistake. But yes the T configuration is correct for your car. The blow by is sucked in to the manifold mixed with air at the injectors. With the problems a couple of people have with the turbo not working I have to assume we have checked all the obvious stuff right? Are the throttle plates opening up all the way? Anyone adjust the idle setting or the throttle cable on either end without loosening and readjusting the throttle position sensor? Just wondering.
Calvin
Sorry if I made a routing mistake. But yes the T configuration is correct for your car. The blow by is sucked in to the manifold mixed with air at the injectors. With the problems a couple of people have with the turbo not working I have to assume we have checked all the obvious stuff right? Are the throttle plates opening up all the way? Anyone adjust the idle setting or the throttle cable on either end without loosening and readjusting the throttle position sensor? Just wondering.
Calvin
I have not messed at all with the throttle cable, but I have replaced the TPS. But I was not aware that there might be any necessary adjustment. In fact I don't see how it is adjustable. The mounting screw slots on the TPS have only about a degree or two of slop. What am I missing?
Walt.
Walt.
The TPS from what friends tell me is supposed to provide continuity at idle and at plus 30% throttle opening, hopefully this is correct as it was over a few drinks and I am not much of a drinker these days. After the idle is set adjust the TPS to barely give continuity, above idle it is open, plus 30% throttle continuity. This is what was thrown around at the chat have not confirmed this by the written word yet. I think there is section in the service manual about the TPS adjustment from what was also told.
Calvin 90 SE
Calvin 90 SE
Jason:
Have your fuel pressure checked. I car was displaying symptoms problems very similar to yours. My problem turned out to be a bad fuel pump. The bad pump would supply just enough fuel to run the car to about 3000 RPM under load, and 4-5000 RPM with no load, but absolutely nothing more.
I bought a fuel pressure tester and ran my own test. The manual says you should get 61 psi at the shrader valve on the FPR, and if you don't, you should check for flow restrictions, and if there are none, replace the pump. I got only 42 psi. on my test. No other problems, so I replaced it. Now my car drives like a dream.
P.S. Best to replace the fuel filter while you are at it. It's only $15.
Have your fuel pressure checked. I car was displaying symptoms problems very similar to yours. My problem turned out to be a bad fuel pump. The bad pump would supply just enough fuel to run the car to about 3000 RPM under load, and 4-5000 RPM with no load, but absolutely nothing more.
I bought a fuel pressure tester and ran my own test. The manual says you should get 61 psi at the shrader valve on the FPR, and if you don't, you should check for flow restrictions, and if there are none, replace the pump. I got only 42 psi. on my test. No other problems, so I replaced it. Now my car drives like a dream.
P.S. Best to replace the fuel filter while you are at it. It's only $15.
Thanks! I'll have it checked out. Right now, I'm having the impeller replaced to see if that has anything to do with the issue. (It's never been changed - car is at 25,xxx miles right now.) The car runs ok when cool, but then gets the symptoms described after it warms up. I'll have the fuel pressure checked just to make sure.
Thanks again and I'll let you know what happens!
- Jason
Thanks again and I'll let you know what happens!
- Jason
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