JimmyB

This is a follow up to my thread on the instal and uninstall of a throttle body spacer.

I am now getting 2 error codes: P0172 System to rich Bank 1 and P0170 Fuel trim malfunction bank 1.

Below is my original thread. Does anyone have any suggestions?

I was given a throttle body spacer with gaskets. I was curious if I would see any differance after install. So yesterday I installed it, adjusted the throttle cable and made sure that everything was done properly. I have a 70mm TB matched to a ported & polished (to 70mm) intake manifold. The spacer is also 70mm and I also used 2 new gaskets that are 70mm.

When I tried to start the car I would hardly start and when it would start it would not idle. It was also spewing a blueish smoke. The were no CEL codes be thrown.
I took the spacer out reset everything, started the car and everything was fine.

JimmyB

Any suggestions Please

JimmyB

Could someone offer some advice PLEASE?

Slows2k

Have you cleared the DTC's?

If so have they recoded?

JimmyB

I cleared evrything & I also decided to check the spark plugs. Those looked good, but the 3rd from the front was somewhat loose. I retorqued them to 18lbs, ran the car for a bit and no problem.

I think it may have been both the car not liking the throttle body spacer and the loose plug. I'll keep my fingers crossed. Thanks

jirro22

P0172

DTC P0171: Fuel System Too Lean

DTC P0172: Fuel System Too Rich

NOTE:


If some of the DTCs listed below are stored at the same time as DTC P0171 and/or P0172, troubleshoot those DTCs first, then recheck for P0171 and/or P0172.
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP)sensor
P0133, P1157, P2195, P2238, P2252, P2A00: Air fuel ratio (A/F) sensor (Sensor 1)
P0134, P0135: Air fuel ratio (A/F) sensor (Sensor 1) heater
P0137, P0138, P0139: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
P2646, P2647, P2648, P2649: VTEC system
P2279: Intake air leakage
P0443, P0496: EVAP canister purge valve



Check the fuel pressure. Is the fuel pressure OK? YES - Check the engine valve clearances and adjust if necessary. If the valve clearances are OK, replace the injectors, then go to step 2. NO - Check the fuel pressure.
If the pressure is too high, replace the fuel pressure regulator, then go to step 2.
If the pressure is too low, check the fuel pump and the fuel feed line, then go to step 2.
Turn the ignition switch ON (II).
Reset the ECM with the HDS.
Do the ECM idle learn procedure.
Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions:
ECT SENSOR 1 above 158 degree F (70 degree C)
Transmission in 5th gear
Drive at a steady speed between 15 - 75 mph (24 - 120 km/h)
NOTE: DTC P0171 and/or P0172 may take up to 80 minutes of test driving to set. Using the HDS, monitor the air fuel feed back average (AF FB AVE). If the long term fuel trim/air fuel feed back average stays within 0.81 - 1.17, there is no problem at this time.



Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0171 or P0172 is indicated, go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

jirro22

hope this helps

bd307

Did you solve the problem?

My car is acting up at times (jerking, low power, idle at low rpm - 2-3 bars). I've been getting the same code for some time now - fuel too rich.

I've replaced the MAP sensor, O2 sensors, temperature sensors. The car is bone stock. Leakdown and compression tests come out okay.

I've tried to replace the cat with a test pipe, but the problem came back. Thought the cat was clogged with all the rich fuel.

Let me know what have you done to solve the problem. I am thinking to replace the FPR, but don't want to spend more money if this does not help.

Kirpich

jirro22, his problem is clearly attributed to the throttle body, since it runs fine OEM setup.

Put the throttle body on and get an A/F reading.

Also check the idle control valve on the bigger TB. It may not be calibrated the same (not the same amount of air at idle) and give you a headache.