did some modding, now car runs lean as hell and overheats, im lost (searched)

[matt4pl]

ok so i installed itb's on my KA. its a 96 with all the good ole OBD2 junk, but nothing was hooked up except the essentials (MAF, O2), afterwards it started overheating, so i stopped driving it anywhere except to work and back (4-5 blocks). didnt even get a chance to heat up.

i have no leaks, the coolan/heater lines are hooked up in the same way as stock. i replaced everything: radiator, water pump, thermostat, all lines. car also runs very lean.

i dont see any leaks and in the past week when i replaced all the cooling stuff, fuel filter, and O2 sensor. i looked over all my vaccum stuff and its all fine. FPR is hooked up to all 4 runners, new fuel filter. i connected the IACV, MAP/baro system, and evap system. egr is totally out save for hte solenoid. compressions came back 170-180 across all cylinders, no mixed fluids AFAIK

took it to a shop (hated doing that) and had em check for a blown headgasket. they didnt do a leak down test but said they had a machine for that sorta thing and didnt find anything that would suggest a blown HG.

im totally lost, this doesnt make sense, at all, cause well, if it did i would have fixed it. maybe this belongs in the nissan tech forum but i dunno, its late, im tired, sick of the car, going to bed...

[ricebike]

did shop check timing/ check trouble codes/ no egr=chance of higher temps!

u told the shop it's running lean? and all the stuff u listed on this thread?

[matt4pl]

i checked cam and distributor timing, its fine. i did tell the shop about the lean condition. i dont think not having an egr system would affect operating temps?

[ricebike]

read about it on how stuff works dot com... then get back to me :P

ps any stored trouble codes?

how's the condition of your fuel injectors since you already ruled out a clogged filter?

just throwing darts @ your diagnostic dart board stuff the shop shoulda asked

[matt4pl]

good point on the egr...i've never heard of anyone having overheating/lean issues after removing their egr stuff. I have the solenoid plugged in but not connected to vaccum, however i also dont have the resistor on the egt probe for the egr system in place..

another thing thats making me wonder... my stock and aftermarket gauge both read very high temps (250+). the stock ecu is programmed to turn on the a/c fan on s14's at 210 (low speed) and 215 (high speed). my fans didnt turn on til after hte autometer gauge was pegged (i was doing stuff in the engine bay... didnt think the temp would spike that fast)

[matt4pl]

i pulled the codes off the ecu, i got one for the knock sensor, the crank position sensor on the bell housing, and one for the IACV-AAC vavle... no coolant sensor code? wtf... this is getting wierder the more i look into it

[ricebike]

just reset ecu & drive a bit then recheck if same codes came back... just to rule out a ghost.

confirming that the a/c kicked on @ their calibrated temps was a good sign...

hmm, mebbe the autometer guages are incorrect w/ their calibration??? hopefully, u or some1 else got an infrared temp tool to see... or some other way to validate your coolant temps are read correctly by your aftermarket gauges.

:shrugs

[matt4pl]

well both the autometer and stock gauge read overheat. im gonna try to ground the intake manifold better, since the ecu's temp sensor is a 2 wire, both running from the ecu, per the fsm. got 2 spare fuel pumps laying around, i read a clogged fuel filter or kinked line or w/e can cause a fuel pump to crap out or not work as efficiently so give that a shot, found i had 2 kinked coolant hoses which i could have sworn i positioned so it wouldnt kink so gonna straighten those out, and then cross my fingers and hope for the best. also gotta clean the MAF for good measure... been doing a lot of reading and searching.

what sucks is that i NEED this car running ASAP. i start school in 3 weeks and its gotta be reliable by then

[ricebike]

ok so i installed itb's on my KA.

itb's= independent throttle bodies?

well, there's your problem! I dunno if the stock ECU can be made to work w/ this setup... cause it's supposed to be reading how open one throttle body is in relation to fuel/air mixture... that may be the problem of your lean condition

u may have to venture out to nissan online mechanic for more help...

GL!

[neverlift]

a stab in the dark but, you did burp the coolant system with the air bleed screw?