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Lack of power


JMG

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Hi,

I experienced 2 problems last months with my Esprit Turbo SE. First, the idle was high and caused code 35 (1200 RPM with IAC to 0 when warm and a requested RPM of 997 from ECU).

Second, I got very big lack of power and could not get more than 0.2 bar of boost. Mixture was very lean.

I solved the first 3 days ago. After looking for vacuum leaks using a special product (initially designed to cold start cabs cars) and not finding any leak, I turned the throttle stop screw by 3/4 of a turn and get 1000 RPM with IAC to 20.

I solved partially the second problem. I got a fuel gauge and saw my pressure was dropping to 0 in 20 seconds after the fuel pump stopped so I changed the fuel pressure regulator and now it holds to 2.6 bar after pump stops (3 bar with pump turning and car at idle). Now car run better but cannot boost above 0.4 bar and is not as rough as when all was good.

I think it is my MAP cause it seems to have unwanted drops and integrator then rise.

Before buying a new MAP, I may have your advise cause I am not a specialist in Freescan diagnostic so I am not sure my MAP is faulty.

I cannot log during drive cause my laptop battery is dead but I have done a log during warm phase with the car stopped and the map values seems to me bad.

I just started the engine from cold (coolant temp : 20 °C, and stopped it with coolant at 68 °C). Throttle is always 0. High idle was not fixed at this time so it was 1200 when warm.

With engine off, Baro was 0.85 but MAP was 0.89 (normal ?).

I attach a picture with the graphs from the log for RPM, MAP and integrator (I just let the car idle and warm and never used throttle wich is always 0).

post-601-0-10730300-1313617757.jpg

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Shouldn't map at idle be around the 0.2 mark? That is reading atmospheric pressure!

Check the pipework to the Map sender and check all the little rubber elbows. My car had chafed through the little hose to the fuel pressure regulator.

Lotus Esprit S4 - Work in progress

Porsche 924 Turbo - Parts chaser

Smart Roadster Coupe - Hers

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I use Freescan. How can I get a log of MAP without using Freescan if it is not accurate ?

I know it does not read values in barometric units but what seems to me incorrect is that MAP drops from 0.45 to 0.20 with RPM just dropping from 1400 to 1200 and no throttle openning. Is it possible to have such difference just for 200 RPM less ?

And why integrator begin to increase from around 128 to 160 when MAP drops ?

I see that my picture has been reduced when I posted it so legends are unreadable.

First graph is RPM and scale values on left are in range 0 - 2500 in 500 increments.

Second graph is MAP and scale values on left are in range 0 - 1 in 0.1 increments.

Third graph is integrator and scale values on left are in range 0 - 250 in 50 increments.

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I use Freescan. How can I get a log of MAP without using Freescan if it is not accurate ?

Try Espritmon or TunerPro

  I know it does not read values in barometric units but what seems to me incorrect is that MAP drops from 0.45 to 0.20 with RPM just dropping from 1400 to 1200 and no throttle openning. Is it possible to have such difference just for 200 RPM less ?

I do not use Freescan so I do not know whether this is a typical result.
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Hi guys i like reading things as its how to learn about the Esrit,s do i need a special cable to connect my laptop to the car or do i need a special computer like my brother would use as hes an auto spark [a bright spark i call him lol] so any info would be appreciated thanks hardluck09 Randal

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You need a Freescan cable, you can get them from this nice chap as we're out of stock...

http://aldlinterface...ct.php?prodid=3

PM/Email Geoff as I believe he does have them in stock, tell him Bibs sent you :)

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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Prefer the USB cable. Many computers have Windows drivers which can only handle the standard Baud rates of Microsoft so you can't get the 8192 BPS with those computers. For that reason, the serial version of cable is a problem. I got it thirst cause USB version did not exist and had to try at least 10 computers from friends to find one wich works (if it does not handle the correct BPS, you can only read basic values like RPM).

USB cable has its own driver, so it always works.

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The link I posted is for the USB cable!

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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