Question about Ford E-350

1 Answer

1989 ford 350/changed tps /and temp sensor and o2 sensor now vehicle very hard to start when cold and scan shows lean condition. help thanks

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 674 Answers

Check your tps setting may need adjustment.

Posted on Sep 10, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2004 Malibu LS runs fine but when I warms up I will run sluggish and stall


Hi Robert, The link below is a short youtube video showing how to test and fix a car that shuts off randomly, Hope this helps.....CHEERS..
https://www.youtube.com/watch?v=oBo-vmEEwv4

Mar 31, 2016 | Cars & Trucks

2 Answers

02 f150 5.4 runs ruff after it warms up


Check the throttle plate for varnish or carbon build up , clean with throttle plate cleaner . Have engine sensors scanned with a scan tool ,mass air flow sensor may be dirty . I'd tell you to check fuel trims with scan tool but you are probably not familiar with these . They show how much fuel the engine computer is adding or subtracting . Great diagnostic tool for trouble shooting engine running problems . Also a scan tool is great to check O2 sensor switching rich to lean an back to rich signal . The engine runs in open loop when cold which means the PCM doesn't look at O2 sensor data till warmed up . PCM/ECM adds more fuel till warmed . Then it will go into closed loop fuel control , the PCM/ECM watches O2 sensors . May have a vacuum leak ,check with can spray carburetor cleaner ,spray around the intake manifold an listen for the engine RPM to pick up or may even stall the engine. Understanding Short Term and Long Term Fuel Trim

Dec 06, 2015 | Cars & Trucks

1 Answer

1993 silverado454as rough idol and lope when cold run smooth when warm up.


You will need to have the vehicles computer scanned for sensor operating parameters and find out if the problem is from running lean ( not enough fuel ) or rich ( too much fuel ) when cold. I would suspect a lean condition and some things that may cause this are vacuum leaks (intake manifold gasket) coolant temp sensor out of range, o2 sensor not operating properly. A scan test will help find the source of the problem

Jul 25, 2015 | Cars & Trucks

1 Answer

Changed o2 sensor and trouble code p1131 keep coming up


What make vehicle do you have ? This code doesn't necessarily mean the sensor is bad ! That is why these thing's need to be tested before replacing , check with a scan tool that shows engine data . This code indicates a lean condition ( vacuum leak ) or a ( fuel problem ) P1131 Lack Of HO2S Switch Sensor Indicates Lean Fixed Lean O2 Is the sensor lying

Jun 07, 2015 | Cars & Trucks

1 Answer

Ford p1151


This code is related to the oxygen sensor on the drivers side of the vehicle. Most times the sensor just needs to be replaced. If you want to make sure, it is the sensor and not a wiring problem or another condition causing this you would need to preform the following test.


Monitor the bank 2 oxygen sensor (O2) voltage on the scanner. If it's showing lean (under 0.5 V), force the engine rich using some propane or carburetor spray. The O2 should go to 0.8-0.9 V.

If the O2 does not go rich as it should, check the voltage at the O2 sensor on the Black (BK) wire. Perform the same test adding external fuel. If the O2 shows rich when using a voltmeter, re-check at pin 44 Red/Black (RD/BK) wire at the Powertrain Control Module (PCM).

If the voltage at the PCM is low as the scanner shows, but the voltage at the sensor responds and goes rich, locate and repair the open circuit in between the PCM and O2 sensor connector.

If the voltage is stuck lean at the O2 and PCM using a voltmeter, cut the BK wire at the O2 sensor leaving all other wires connected. Re-check the voltage on the BK wire. If it now goes rich when adding fuel, check the RD/BK wire for any continuity to ground and repair the wire as needed.

If the wires test out OK and the O2 sensor does not switch as it should, replace the O2 sensor and retest.



Hope this helps.

Apr 17, 2012 | 1996 Ford Econoline

1 Answer

99 rodeo starts hard after is has been warmed up. Starts fine after it has been sitting overnight. Almost starts like it is flooded. Have changed O2 sensors, coolant temp sensor. Cleaned IAC


Hello, I usually work on Ford family Brands. There are sometimes 2 temperature sensors on engines. One is meant for the dash gauge alone and the other is for the Engine management systems.

You could have one of several problems. A starter can sometimes fail becauseof heat. You would need to do a draw test when the motor has been run to duplicate your problem. Autozone, Advance, and Oreillys are some of the free test places.

The cold start cycle is like an Electronic choke. If the temperature info is not reaching the Engine management controls then the vehicle will always be set for a cold start.

Lean conditions also can lock an engine. In order to get good mileage the Camshaft timing is advanced. If the engine has worn timing parts, the firing may advance beyond specs. You may be fighting compression and experiencing vapor lock. Try going up a Grade in gas Octane.

Nov 18, 2011 | 2000 Isuzu Rodeo

1 Answer

2001 Ford Explorer Sport running too lean in both banks


any of those sensors can cause that but the best thing to do is scan it or check for a vacuum leak with a smoke machine.

Jul 22, 2009 | 1998 Mercury Mystique

1 Answer

Car keeps dying


Trouble Code 33 and 34 are the MAF/MAP Sensor Circuit. It sounds like you've replaced that sensor already. Did you also have the code 34 before putting in the new sensor?
Or did this code start after it's replacement? Any other codes appearing?

Troubleshooting it would depend if it has the Speed Density Update. The dealer should be able to provide that info.

Here's your fault code list:

13 oxygen sensor circuit 14 coolant temp sensor circuit (high temp) 15 coolant temp sensor circuit (low temp) 21 throttle position sensor (TPS) circuit (high signal) 22 throttle position sensor (TPS) circuit (low signal) 23 manifold air temp (MAT) circuit (low temp) 24 vehicle speed sensor (VSS) circuit 25 manifold air temp (MAT) circuit (high signal) 31 wastegate solenoid electrical circuit 32 exhaust gas recirculation (EGR) circuit 33 mass air flow (MAF) circuit (gm/sec high) 34 mass air flow (MAF) circuit (gm/sec low) 41 cam sensor circuit 42 C3I EST or bypass circuit failure 43 electronic spark control (ESC) circuit 44 oxygen sensor circuit (lean exhaust) 45 oxygen sensor circuit (rich exhaust) 51 PROM error 52 calpak error 55 ECM error

Aug 07, 2008 | 1989 Buick Regal

1 Answer

Buick lesabre nightmare 2


  • The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

Jul 31, 2008 | 1992 Buick LeSabre

2 Answers

89 ford f 150 5.0


you should always start with the basics ,a cap ,rotor and a set of wires to start

Jun 15, 2008 | 1989 Ford F 150

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

94 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Fordexpert

Level 3 Expert

5331 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...