89 SE Loss of Power No CEL

[scottytwo]

As above, my 89SE coughed a couple of times and then seemed to go into a limp home mode with no CEL.

It starts but sounds a bit tinny and has no oomph. When the throttle is pressed, it does not respond instantly, but slowly. No misfire as such. When I checked the codes, there was the usual IAC issue (previous post) and a Knock sensor which cleared.

I attach two files, one on a short run, the other while idling with the car static.

Any ideas?

(This month I have had 4 of my vehicles pack in, blow head gaskets, or fail MOTs , now this!)

poor run static 26th Sept.xls Poor Run 26th Sept.xls

[Escape]

I'd start with a visual check: are the various small 'vacuum' pipes from the plenum to the pressure regulator, MAP etc still connected and intact?

[Sparky]

TPS numbers look a bit strange...

[scottytwo]

That's good call. Had the same with a Rover 820. Will check it.

[scottytwo]

Mmm TPS is reading OK on Freescan 0 to 100 and not jumping about. 

Getting a fellow Lotus enthusiast to come and have a look at the weekend. 

[Bibs]

Have you checked the vacuum pipes, especialliy the elbows?

[Chillidoggy]

Unless I’m mistaken, even at full MAP, there’s no wastegate or secondary injector readings. Is that right for the model?

[jonwat]

On 27/09/2024 at 10:58, scottytwo said:

seemed to go into a limp home mode with no CEL.

Does the CEL still light up when you turn the ignition on?

[sailorbob]

22 hours ago, Chillidoggy said:

Unless I’m mistaken, even at full MAP, there’s no wastegate or secondary injector readings. Is that right for the model?

The coolant temperature does not get high enough for boost control and neither RPM or MAP get high enough for the secondary injectors to be used.

[Chillidoggy]

2 hours ago, sailorbob said:

The coolant temperature does not get high enough for boost control and neither RPM or MAP get high enough for the secondary injectors to be used.

What does Freescan log full boost on the SE log as?