check engine codes and heat question
check engine codes and heat question my heat isnt hot. where should i start troubleshooting? everything blows properly, and the a/c is ice cold, just not hot like it once was. i havnt ran the heat since last year.
also, im throwing (intermittently) a 171 and 174. system too lean bank 1 and system too lean bank 2. o2 sensor? other than that, car is running great.
thanks guys!
also, im throwing (intermittently) a 171 and 174. system too lean bank 1 and system too lean bank 2. o2 sensor? other than that, car is running great.
thanks guys!
11 Second Club
Joined: Nov 2001
Posts: 300
Likes: 1
From: Central Florida
I doubt its the O2 sensors since it's on both banks. It's more likely something to do with fuel delivery common to both banks, such as a clogged fuel filter, or perhaps a failing fuel pump, which can be a result of pumping against a clogged fuel filter.
Check coolant level. Heater is the first thing to go if the coolant is low.
+1 for fuel filter.. do a pressure check at the rail and rev it a couple times. Could also be pump. Stock tune?
+1 for fuel filter.. do a pressure check at the rail and rev it a couple times. Could also be pump. Stock tune?
11 Second Club
Joined: Nov 2001
Posts: 300
Likes: 1
From: Central Florida
I thought about this, but could the coolant get to a low enough level to affect heating without the warning light on the dash illuminating? Just curious. I've had the coolant level sensor fail altogether (which just turns on the idiot light if the sensor is stuck at the low-level setting) but I never had my coolant get low enough to affect the car's operation.
11 Second Club
Joined: Nov 2001
Posts: 300
Likes: 1
From: Central Florida
I'm assuming you checked the coolant level and it was satisfactory...?
Yes. Turn the key on but don't start the engine, then pull the relay for the fuel pump and start the car. Allow it to run out of gas and stall. This will depressurize the fuel system and take much of the fuel out of the filter. Then you need a few rags, a fuel disconnect tool kit (cheap hard-plastic ac/fuel disconnect tools are available at most auto part stores) and a new filter. You'll need to get the rear of the car up in the air to get at it comfortably.
Yes. Turn the key on but don't start the engine, then pull the relay for the fuel pump and start the car. Allow it to run out of gas and stall. This will depressurize the fuel system and take much of the fuel out of the filter. Then you need a few rags, a fuel disconnect tool kit (cheap hard-plastic ac/fuel disconnect tools are available at most auto part stores) and a new filter. You'll need to get the rear of the car up in the air to get at it comfortably.
Mass air flow sensor if the car is not running rough then check it and clean it, reset the light and see what happens.
http://www.obd-codes.com/p0171
http://www.obd-codes.com/p0174
Fuel filter is super easy, instruction above are very good. I've never needed the disconnect tool on my car I just pinch the white coupling with my fingers.
Heat, thermostat could be stuck open. Change it, it's easy and will eliminate one thing. If it does not fix the problem suspect the blend door, assuming the coolant is ok.
http://www.obd-codes.com/p0171
http://www.obd-codes.com/p0174
Fuel filter is super easy, instruction above are very good. I've never needed the disconnect tool on my car I just pinch the white coupling with my fingers.
Heat, thermostat could be stuck open. Change it, it's easy and will eliminate one thing. If it does not fix the problem suspect the blend door, assuming the coolant is ok.
Trending Topics
You may have a little air leak and unmeasured air is slipping passed your MAF.
Just for sport, spray your MAF with some cleaner, and make sure when you button it up, the seals dont leak.
Just for sport, spray your MAF with some cleaner, and make sure when you button it up, the seals dont leak.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
