D Jetronic low to mid throttle surge

Hi Tim,

throttle switch 0 280 120 018 is also correct. Normally correct ECU and MAP sensor can be combined without problems. They were not tuned to each other. Of course tolerances of both can negatively add up. But if your MAP sensor is with rivets, has a date of manufacture from 70s (3 digit no on rivet upper right) and keeps vacuum, I would not be too suspicious about it. On the other hand there must be a reason why it was swapped.

But try fuel pressure first.

Volker wrote: ...

But try fuel pressure first.

... and check the vacuum line towards the MPS.
A clogged or broken line would lead the MPS to transmit 'full throttle' signal towards the ECU in every condition except idle.

Regards
Norbert

Hi Norbert, haven't had a chance to do any work on the engine but I have sourced another spare computer and MAP from an R17 Gordini.
I'm waiting on some brake parts to come back, I'm replacing the Renault 16 brakes with vented brakes from a '95 Renault Clio. Should be driving again next week hopefully.

Hi Tim,
nice to hear from you again.

The ECU from the R17 Gordini is the same as your original one.

But the MAP isn't a perfect fit.
The R17 MAP is a 0 280 100 031

You need a 0 280 100 055 as I wrote before.


Regards
Norbert

Hi Norbert, I haven't picked up all the parts yet so not sure about the number, I expect you'll be correct! It's part of a package of parts from a guy who converted to a modern computer. Spare fuel rail, and cleaned injectors too.

Hi, I've got my hands on a pressure tester. The car was sitting at 1.6bar, now at 2.05. Running much better.
I've got the 055 MAP sensor fitted, I might be imagining it but the car revs out better?
I'll check all the other sensors too.
Thanks for your help, I'm sure I'll be back!