SPONSORED LINKS

1985 Toyota MR2 Fuel Issues

Tiny
WKRIZAN
  • MEMBER
  • 1985 TOYOTA MR2
Engine Mechanical problem
1985 Toyota MR2 4 cyl Two Wheel Drive Manual 130k miles

I am down to the last two possible problems with a fuel issue that I have been having. I have replaced the in tank fuel pump and a new in tank filter. EFI relay switch and fuses as well, along with a new external fuel filter. The only other thing that I can think of is the injectors or mass air flow sensor. How can I determine which of the two is actually the problem sense they both are outrageously expensive? Is there a test that a back yard mech. Can do to find out which of the two it is?
SPONSORED LINKS
Monday, June 23rd, 2008 AT 3:03 PM

8 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
What exactly is the issue you are attempting to resolve?
Was this
answer
helpful?
Yes
No
Monday, June 23rd, 2008 AT 3:11 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If you're talking about No fuel to cylinders-inspect and test the circuit opening relay and MAF sensor-

When the MAF sensor grounds the Fc circuit of the COR this is when the fuel pump powers up-
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, June 23rd, 2008 AT 3:15 PM
Tiny
WKRIZAN
  • MEMBER
  • 7 POSTS
I am getting fuel, after replacing the EFI relay switch, fuel pump and filters. She now idles fine but when I put her in gear there is no power to even get out of the driveway. So that is the problem, she idles fine but in gear she is starving for fuel push the clutch back in and it returns to normal idle. That is why I was thinking injectors or mass air flow sensor, unless I am missing something?
Was this
answer
helpful?
Yes
No
Monday, June 23rd, 2008 AT 5:01 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test the throttle position sensor-
Was this
answer
helpful?
Yes
No
Monday, June 23rd, 2008 AT 5:16 PM
Tiny
WKRIZAN
  • MEMBER
  • 7 POSTS
Resistance reading for the TPS, throttle fully closed.2 throttle fully open 4.65 indicates bad TPS?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, June 23rd, 2008 AT 6:42 PM
Tiny
WKRIZAN
  • MEMBER
  • 7 POSTS
Does anyone know if that is within specs?
Was this
answer
helpful?
Yes
No
Wednesday, June 25th, 2008 AT 6:16 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Adjust the TPS


https://www.2carpros.com/forum/automotive_pictures/12900_mrtps1_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_mrtps_1.jpg

Was this
answer
helpful?
Yes
No
Wednesday, June 25th, 2008 AT 8:39 AM
Tiny
DONUTMAN1
  • MEMBER
  • 1 POST
Does yours backfire through the intake? Does it do it all the time or intermittently?

I tried swapping MAFs and throttle bodies with known good units. That didn't do anything. Please let me know if you figure yours out and I will let you know if I figure mine out!
Was this
answer
helpful?
Yes
No
Friday, July 11th, 2008 AT 1:52 AM

Please login or register to post a reply.

Related Mass Air Flow Sensor Test Content

Sponsored links