I've searched, troubleshooted, and messed with this thing far enough. I need Help. Please.

The Rundown - 91 Civic Si with a D16z6 Obd1 Conversion swap chipped P28

The Problem - Coolant Temp Guage, takes awhile to warm up, and WHEN it finally does, It's maybe 1/8-1/4 of the half way (not normal operating).

Car seems to run rich, bogs at low rpm, good midrange, vtec has zero power.

NO CEL's

Heater works Excellent

Radiator fan ALWAYS RUNS when motor is on. Does not cycle at all.

What I've done: Pulled Engine Temp Sensor, lightly sanded & cleaned it
Pulled Guage sending unit, light sanded & cleaned it
Put in new Thermostat & Seal
Flushed Coolant, Let it bleed for at least a good 20-30 (no more bubbles)

I'm truly stuck, pleaseee Help. Thanks

 

subscribing bump. im having the same problem my car will reach temp but it takes like 15 minutes of driving and until its warm it runs retarded, running up my gas bill!

when you say your fan stays on do you mean your large fan or the secondary. my large fan stays on all the time as well, i didnt know if that was normal.

 

its problee wired to come on right away thats how mine is you need to wire it to the thermostat housing

 

what are you chipped with?
has it always done this?

 

my car does the same its fine if the fan comes on like that but u can fix it just i dnt kno how i know ur temp sending is workin so if u really want to make ur car warm up faster put a 92 to 95 radiator out a civic there half the size 88 to 91 has a huge *** radiator chunk it did u do a mpfi swap

 

oh its a si my bad

 

No AC, only one fan.

-It comes on immediately and runs continuously.

I'm thinking the coolant temp sensor & sending unit are jacked.. but no CEL's and I cleaned them both. anybody else have issues like this?

 

try changing out the coolant switch, this controls the fan. once it reachs temp it conects the circut. check with ohm meter for sure resaults

 

This is the one on the BACK of the block correct, under the intake mani..?



Also, the temp never reaches 'full' operating temp.. but the guage works. could the sensor itself still be bad..? I took it out and cleaned it..

 

if the fan is not cycling it will not reach temp. start it up and unplug the fan switch. I have changed them for not coming on, but never sticking on.

If you wanna check..
"
# Meter should indicate continuity when temperature reaches 190-203°F.
# Allow sensor to cool while observing meter. Meter should indicate no continuity as temperature drops below approximately 182-188°F.
"

 

yes,

 

thanks, please stay posted I will try this tomorrow.


I'm pretty familiar with my honda.. but this civic is acting weird as ****, never seen this before.