renix

[rick smith]

Is the ect sensor at the bottom of the block on1987 4.0 the sensor that controls fuel enrichment for cold starts. WHEN THE WEATHER IS WARM THE ENGINE TURNS QUITE LONG BEFORE IT WILL START LIKE IT IS FLOODED.  When  IT IS COLD OUTSIDE IT STARTS MUCH QUICKER. Before I buy one would like to know ,part number would be nice! Thanks

[fiatslug87]

The one that’s just above the oil pan (driver side) is the knock sensor, the one farther up and back is the coolant temp sensor.

[rick smith]

That's just it I think there is like 3 ect one for guage one near radiator . only one controls fuel enrichment and I don't know which one . Thanks

[89 MJ]

Can you post a picture of the ones you are thinking it might be?

[Gojira94]

24 minutes ago, rick smith said:

I think there is like 3 ect one for guage one near radiator

 

Yes, on Renix, there's a max of 3. The one at the back driver's side corner of the head feeds the gauge. The second one is on the driver's side of the block above the oil pan and behind the knock sensor, and it is the one that gives the ECU an ECT signal. The possible third is on the lower driver's side of the radiator (large diameter) and it's a temperature switch to close the relay circuit to turn on the electric cooling fan (if equipped). 91-up is HO and moves functions of 2 & 3 above to a single sensor in the thermostat housing. early-mid HO era keeps the gauge cluster sending unit/ switch at the back of the head, for either temp gauge or engine hot lamp.

[pizzaman09]

Can you define long cranking?  These Renix systems do crank long typically, but as long as you are not having starting issues, it is fine.

[ghetdjc320]

Keep in mind that the fuel tables will typically provide less fuel when starting up while warm and not more fuel. 

[rick smith]

Thanks thats what I needed to know. The long cranking means holding start for10 secs or longer. Before it would fire up at any temp almost immediately. I know it needs less fuel when warm, It seems like it's enriching at every start which makes me believe it,s getting a cold reading from ect. It starts much quicker when cold outside. I maybe wrong but I need to change antifreeze anyway, it's going to be messy. Thanks for the replies 

[llhat]

would you not test the resistance of the sensor ?   unless wanting to change it out anyhoo...  and yep,  gonna lose some fluid (most of it)

 

[ghetdjc320]

2 hours ago, rick smith said:

Thanks thats what I needed to know. The long cranking means holding start for10 secs or longer. Before it would fire up at any temp almost immediately. I know it needs less fuel when warm, It seems like it's enriching at every start which makes me believe it,s getting a cold reading from ect. It starts much quicker when cold outside. I maybe wrong but I need to change antifreeze anyway, it's going to be messy. Thanks for the replies 

It could also be that it’s starving for fuel when warm. Seen this happen in many older efi systems. Try adding a bit of gas to the TB and see if it fires up