DTC's & Loseing coolant..

[Silk90]

So I have already replaced my Power output phase's, spark plugs and maf and i am still throwing these codes i was hopeing to get some input on possable fix's before i go spend all my money on more stuff i don't need


16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10
16621 - Turbocharger Boost Sensor (A) Circ Low Input
P0237 - 35-10
16490 - Manifold Abs.Pressure or Bar.Pressure Range/Performance
P0106 - 35-10
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00
16688 - Cyl.4 Misfire Detected
P0304 - 35-10
16689 - Cyl.5 Misfire Detected
P0305 - 35-00
16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 35-00
16815 - Shareware Version. To Decode all DTCs
P0431 - 35-00
16690 - Cyl.6 Misfire Detected
P0306 - 35-10
17865 - Exhaust Gas Temp Sensor 2 (G236): Open or Short to Plus
P1457 - 35-10
16687 - Cyl.3 Misfire Detected
P0303 - 35-10
17521 - Bank1-Sensor1 Internal Resistance too High
P1113 - 35-10
16686 - Cylinder 2 Misfire Detected
P0302 - 35-10
17862 - Exhaust gas temperature sensor short 1 to ground
P1454 - 35-10

Also fans do not come on anymore I never go past he middle of the gauge yet i lose LOTS of coolant, after driving to and back home from work for the day my cluster is usually telling me i have no coolant left in my expansion tank.

I would like to blame the loseing coolant on the fans BUT i never heat up and it seems like the coolant comes from the passenger side....

[RolledMySTi]

Wow that looks like it's going to be an expensive mess to fix. I would start with a pressure test. A vacuum/boost leak may be causing the misfires. It looks like both your EGT's are shot. I would replace those first and see what code do you still pull up.

[Silk90]

Wow that looks like it's going to be an expensive mess to fix. I would start with a pressure test. A vacuum/boost leak may be causing the misfires. It looks like both your EGT's are shot. I would replace those first and see what code do you still pull up.

i forgot to mention i did a boost leak test and i have only 1 leak which i am not even sure if it is a leak, i feel some are coming from around the cam chain tentioner where theres a half moon hole on the back of the passenger side head other than that no leaks.


I was thinking maybe theres something in common which is making it look like all these things are gone, like a common ground or relay or something being as i just replaced the MAF and im still getting a maf code, see what I'm getting at

Thanks in advance for further input

[RolledMySTi]

If you just replaced your maf I would double check your connections. Also check you ground connection by the battery and the battery terminals themselves. The battery terminals in my old Probe would get so corroded the car wouldn't start. As soon as I cleaned them the car ran perfect.

When you pressure tested did you just listen for leaks or did you spray soapy water? If you didn't spray soapy water I would test it again. It's hard to hear leaks, but very easy to see bubbles.

[RedRocketS4]

The half moon should be an oil seal for the cam tensioner. Did you change those seals? Is your valve cover gasket leaking? Did you change your t-belt any time recently? Do you lose that much coolant (are you constantly refilling your expansion tank)? Or is your car just telling you that your coolant is low?

Did you check your coil packs when you changed your spark plugs? Which spark plugs are you using? Did you check your O2 sensors?

Sorry to throw so many questions at you, but some things need to be answered.

[JDM EJ1 95]

sounds like somethign major is goin on..


if your losing coolant and your not leaking anywhere its definately burning somewhere.... im going to say you have a headgasket issue or the turbo is burning it somehow..


any white smoke?


and... do a leakdown test.

[Silk90]

no smoke i lose it on the ground, i refill it everyday, recantly did waterpump headgaskets tbelt the whole 9 yards, i skimped out on the valve cover gaskets though and just added silicone on it to make sure it sealed properly.

coil packs are new as of about 6 months ago, plugs are NGK i forgot the specific make of plugs and the gap though i am not home otherwise i would pull out the box's all electrical connections are snug although i will check the battery terminals for the hell of it

i used soapy water and found nothing except like i said behind passenger side cylinder head although i think that was just because i tested from where the maf goes on the y pipe and it was prolly going through the crank case breather.

the car runs fine and has full compression on all cylinders, i have a barely noticeable missfire sometimes at idle but thats about it as far as performance goes but ounce i heat up to operating temp i can smell coolant, the codes just bother me because their there more than anything... will get back on here tommorrow gotta get back to work for now. thanks in advance

Have not touched the o2 sensors yet although i do need to replace one if not both of them and will be gutting the cats while i am down there.

[cowboy]

Shine light on top of engine, towards the rear, is their coolant puddled their?

[Silk90]

Shine light on top of engine, towards the rear, is their coolant puddled their?

no, i forgot to mention the after run pump is brand new aswell the coolant is coming from middle or pasenger side ish, there is some on the transmission

i know there is the pipe that connects the 2 cylinder heads and what not i at first though maybe that was not tightend correctly although it most definatley is, what else is there back there that could possably leak?

there is a 1 way valve which is supposed to be in the hose running to the top of the expansion tank, is it supposed to be positioned so coolant can only get into the tank or out of? i kind of lost that valve a while back and was looking to fix all the lil stuff i could before i ship back out.

[RedRocketS4]

passenger side, rear? have you changed your coolant switch to the updated green one?

have you tried doing a UV light test? Pick one up from autozone or some place like that. Shold be like $15 or something. Put a little in your coolant, run the car and find exactly where the leak is coming from using a black light and the provided glasses. Giving the exact location of the leak would help determine the problem better. Let us know.

For the other stuff, have you checked your EGT sensors and O2 sensors? Looks like your EGT sensors are f'ed. O, and gutting the cats takes a little more than you’re think. You gotta pull the downpipes off to do that. It’s not exactly a walk in the park. I just finished mine and will be putting them on when I do my clutch. Good luck and let us know what’s going on.

For 16490 and 16621, check the sensor on your TBB and clean it with some contact cleaner from radio shack.

[Silk90]

thanx alot for that i will give all that a try on tuesday (my next day off) and let you know how it goes.

so i havent got to do the egt's or o2's because i don't have the money for that right now but all 3 of my coolant sensors look like hell

I have no idea how to test them although i think they are all shot....... i already ordered the green one although i would like to test them to see if it is the sensors or a module before i go spend another 70 dollers on the other 2 sensors.

all of the plugs are mint although i did notice that ive got 4 ngk's 2 off brand spark plugs.

how difficult are the cats? harder than headgaskets? (the hardest part of that was unbolting turbos from manifold IMO)

If you've got any suggestions today i would really appreciate the help ive got alot of the car torn apart inspecting everything and what not. (i don't get off work much)

this line i pointed out right here, there is supposed to be a 1 way type valve in it, which way is it supposed to flow though? towards the expansion tank or towards the rear coolant line thing

[RedRocketS4]

Not sure how to test the sensors. But you can test the plugs with a multi-meter. not sure of the voltage, I just replaced mine when I did them and I’m currently on jack stands with no power.

I would change the spark plugs or go back to where you got them and rip somebody a new a-hole and maybe try to get a new set for free or something. I would always use the same type of spark plug in all cylinders, no matter what car it is.

For gutting the pre-cats, you need to remove cat-back section of exhaust, unbolt the downpipes from the turbos, then gut them and reposition some O2 bungs downstream of the cats. Not sure what position or condition your car is in right now, but getting to the downpipe bolts can be challenging sometimes. Have you checked the head gaskets for the leak? Maybe you didn’t tighten down properly?

For the coolant line, it looks like it’s a return line, so it might direct flow towards the expansion tank, but I can check when I get home, I could definitely be wrong.

Did you find the leak?

[Silk90]

Not sure how to test the sensors. But you can test the plugs with a multi-meter. not sure of the voltage, I just replaced mine when I did them and I’m currently on jack stands with no power.

I would change the spark plugs or go back to where you got them and rip somebody a new a-hole and maybe try to get a new set for free or something. I would always use the same type of spark plug in all cylinders, no matter what car it is.

For gutting the pre-cats, you need to remove cat-back section of exhaust, unbolt the downpipes from the turbos, then gut them and reposition some O2 bungs downstream of the cats. Not sure what position or condition your car is in right now, but getting to the downpipe bolts can be challenging sometimes. Have you checked the head gaskets for the leak? Maybe you didn’t tighten down properly?

For the coolant line, it looks like it’s a return line, so it might direct flow towards the expansion tank, but I can check when I get home, I could definitely be wrong.

Did you find the leak?

did not get an exact place where the leak is coming from although i have a very small area which it could be coming from, although there is the chanse it could be the headgasket i see no logical reason for it.

It is very hard to see being as it is right next to the firewall and it only leaks when the car is on, it comes from somewhere in the general area and then runs down the side of the transmission.


as far as cats go, I don't know why but i think i already did them, i don't remember doing them but while looking for the leak i was looking at the precats and stuff and saw what looked like my ugly welding work.

I should be getting the sensor which triggers the main fan in the mail tomorrow and if that dosen't work I'm just gonna rewire that garbage the way i want it.

spark plugs i will get to after i do egt's and o2's (there goes my spending cash next week)

Don't know when i will ever save up for ko4's the way things have been going lately.

[Affinitive]

i forgot to mention i did a boost leak test and i have only 1 leak which i am not even sure if it is a leak, i feel some are coming from around the cam chain tentioner where theres a half moon hole on the back of the passenger side head other than that no leaks.


I was thinking maybe theres something in common which is making it look like all these things are gone, like a common ground or relay or something being as i just replaced the MAF and im still getting a maf code, see what I'm getting at

Thanks in advance for further input

I would suspect your crankcase breather hose assembly to have failed. Actaully the PCV valve within the breather hose assembly. You should not be leaking anything out of the crankcase when checking intake leaks/boost leaks.
With the engine idling, can you pull the oil cap off with ease or is it hard to take off like there is intake manifold vacuum in the crankcase??? It would certainly explain most of your faults there.

C