Technical Tips > Post 84

1986 C4 MAF Sensor replacement?

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peterw:

--- Quote from: Ausrs on February 24, 2020, 09:13:34 AM ---Fans on at 180
Trans drops in to overdrive at 60 kph instead of 80kph
Later model tune to get rid of the 9th injector
complete vats removal from the prom
Egr removed at the prom

--- End quote ---

Thanks for that info.

My car obviously has a fault which I'd like to solve first but having a custom chip is a great idea.  I like the idea of including improvements that were done in later cars.

The radiator fans on my C4 come on at 220 deg.  Not sure what the thermostat is.

This is correct for the model but seems really high, does anyone know why it is so high?  Maybe an emissions thing?

If the ECM tells the fan to come on at 180 then the fans would run almost all the time unless the thermostat was changed to be less than 180.

I would worry that running the car at 180 when it is designed to run 220 might cause an issue.

Has the 180 fan switching changed how your car runs?

Pete

Ausrs:
Pete
I am very happy with the way my car runs
Changing the tstat is not such a hard thing to do either,One other thing you should consider is removing the hose from your throttle body,it is something we do not need in Australia and again it is an easy bypass
Maybe email Brian and start the ball rolling and ask him about your problem and ask him about the chip
Is your car rhd or lhd ? if rhd I would be looking at the earths to start with

peterw:
My car is LHD, manual, unmodified.  It has 50,000 miles on it.

It was in a collection in California for many years and did about 1000 miles per year in the last 25 years.  It would have spent a lot of time sitting which isn't good for it.

I expect it to have some niggles which I can hopefully overcome with the help of the forum.

Pete

peterw:

--- Quote from: Vettech on February 22, 2020, 08:36:12 PM ---

If suspect CS Injector check,
CINJ/CLU Fuze 5A in Aux fuse block.
Then cold start injector - from memory not easy to get at.
Then ThermoTime Switch - basically a switch with thermal bi-metal strip and heater wire.
This switch is normally closed when cold, powered up when in "start" and CS inj fires fuel in, and heater heats up (~8sec) - once at temp, the switch opens and cuts off the CS inj. Upon second start, since the switch is hot or at manifold temp, it may operate for 0 thru 8sec, if at operating temp, the switch cuts the CS inj out of cct, since its now no longer required.    CS inj located LH side under fuel rail near Injector 5 from vague memory.


--- End quote ---

Is the Aux fuse block the one behind the dash?

If I have to pull the dash apart is there anything else related to the intake system in there?

Pete

Vettech:
Yes. Sorry - ive had battery and other issues.

It is behind the display panel in the middle of the dash.

Along with Starter enable relay, audio alarm module, hazard flasher and horn relay.

With an Ohm and Voltmeter you should be able to firstly check continuity of thermal resistor and actual injector/switch to earth.
Then between cct 806 to earth, turn on ignition - @ 12 volts, if no 12v - fuse gone.
If no continuity thru injector or thermal switch and heater coil - you know what to replace

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