Question about 1999 Volkswagen Jetta

2 Answers

Rough idle and wont accelerate. Sounds like it is Choking.

I have an 2.0 99.5 AEG Jetta. My car started running rough after my I replaced my A/C pump due to a back clutch and bearings, they caused the belt to go. After that the car started idling rough and when the accelerator was presses the rpms would drop and the sounded like it was choking. Then it would clear up and be fine after about 5 min. or less. Finally took it to a shop to have the codes read and got 17536 (Bank 1 To Lean) 16684 (Random miss fire) and then miss fires for cylinder 1, 3 and 4. After leaving the shop on the way to pick up parts the car would not accelerate and was bogging down, would not clear up like before. Check engine light came back on so I rented a code reader and got all different codes. This time they where P1237-1240 (fuel Injector open Cir. in all 4) What I have done so far is replaced spark plugs wires and coil. and fuel filter and pressure regulator. I tested resistance in injectors 1 and 4 and they where normal, tested engine speed censor's resistance and that was normal, and tested the MAF circuit's output at 5v and the repaire manual said it should be about 12v.
Had the sending unit replaced this winter, had kind of the same problems. An O2 sensor code about too big of a difference between the two was also read at that time but did not follow up with it, so nothing was done about it.
Sorry it's a lot to digest but any help would be appreciated. I am out of options besides sending it to a shop and paying them the fumble with it for hours.

Posted by on

  • 2 more comments 
  • leafblad May 10, 2010

    Thanks, Ill looking into the timing and fuel pressure.
    I have also had some thoughts on it being a bad or going bad ECM? And I am not sure if it anything or not but working on the car this weekend when I would get out of it after having it running for a while to see if my fixes had accomplished anything I have been getting a pretty good shock.

  • abaddonsnigh
    abaddonsnigh Sep 24, 2012

    this sounds like the exact same problem im having with my 2.0 99.5 jetta. replaced the plugs, coils, maf sensor, o2 sensor, air filter, and still nothing. did you ever find a fix?

  • cerf_veau
    cerf_veau Dec 24, 2012

    Same problem here , its really like a CHOKE problem , DiD your Cluster Temp gaudge indicate more than 0 when your car is cold ? . ,, if the ecu Think motor are Heated . it would be dramatic for the fuel/air ratio like ours!

  • cerf_veau
    cerf_veau Jun 28, 2014

    its your fuel pump !!!

×

Ad

2 Answers

  • 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.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 834 Answers

That sounds like a MAF (Mass Air Flow) sensor problem to me, are all of the hose clamps tight in the air induction system, especially between the throttle body and the MAF, and that there are no air or vacuum leaks between the throttle body and the MAF?

There is nothing from the air cleaner side of the MAF blocking the flow of air to the MAF?

Posted on May 10, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Volkswagen Master
  • 14,036 Answers

CHECK FUEL PRESSURE IT SHOULD BE 44 TO 52 PSI.ALSO HAVE THE TIMING AND IDLE SPEED CHECKED AND ADJUSTED.

Posted on May 10, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Rough running on acceleration all the time back fires and misses choking


Have the car scanned for diagnostic trouble codes " DTL's ". That should give you a starting point

Feb 16, 2013 | 1994 Mercury Grand Marquis

1 Answer

My 2001 GMC Sonoma is idling rough, starts hard but when accelerates sounds good. I have replaced the fuel pump, fuel filter, and now all the plugs and wires, but still rough?


Check for vacumn leaks ! Idle air compensator? clean throttle valve oppenings and air port opening,do you have check engine lite on,check EGR valve? Dirty fuel injectors ,bad pressure regulator?Check fuel pressure at fuel rail,at idle !

Sep 06, 2010 | 2001 GMC Sonoma Extended Cab

2 Answers

What causes my ford escape to rough idle occasionally?


Could be a fault in the Evap system (a loose/defective gas-cap), water in the fuel, defective I.A.C. is possible.
When the rough idle issue occurs does the engine light come on?

May 14, 2010 | 2005 Ford Escape

1 Answer

Jerky acceleration


check the spark plug gaps. [I think it should be 0.8mm ] too small or too large - for surging [ incomplete combustion ] . rough belts- squeel ? check correct tention & spray some penetrating fluid like CRC on the pulleys . But for the **** I really dont know what to suggest

Jun 19, 2017 | 1993 Volkswagen Jetta

2 Answers

Ford F150 engine backfiring, running/idling rough


I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Apr 16, 2010 | Ford F-150 Cars & Trucks

1 Answer

Fuel Pump Problem?


lots of stuff in the fuel system can couse problem like pressure regulator, pressure switch,or relays. pump could be on way out though.

Mar 20, 2009 | 1998 Mercury Tracer

1 Answer

Po 108 fault code


Sounds more like a mass air flow sensor problem.

Jan 09, 2009 | 2001 Dodge Ram 1500 Truck 2WD

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

Related Topics:

499 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

yadayada
yadayada

Level 3 Expert

76673 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8531 Answers

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

Answer questions

Manuals & User Guides

Loading...