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1994 Acura Integra sputter upon acceleration

Tiny
JMARLEY09
  • MEMBER
  • 1994 ACURA INTEGRA
  • 1.8L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 208,000 MILES
My car sputters out while accelerating. Seems to be mis firing also and doing it until at running temperature. What is causing this?
Monday, February 16th, 2015 AT 2:54 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Has the check engine light come on? When was the last tune up including a fuel filter? Have you checked fuel pump pressure?
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Monday, February 16th, 2015 AT 7:00 PM
Tiny
JMARLEY09
  • MEMBER
  • 5 POSTS
No the CEL is not on. I even jumped the wires to see if it threw a code but it did not.
Distributor was just changed. Spark plugs were changed. Wires seem to look okay. Fuel filter was replaced within a year I believe.

No I have not checked the fuel pressure although I should. What would be the recommended fuel pressure.
I have also noticed that the vacuum line going from the vacuum canister to the Fuel Pressure Regulator seems to be broken off but I didnt feel any suction or blowing.

It also idles low. But will go back to normal idle range at times.
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Tuesday, February 17th, 2015 AT 8:40 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
There needs to be vacuum to the fuel pressure regulator. Otherwise, it will allow the pressure to be too high. You can confirm that when you check fuel pump pressure. However, that could be the entire problem. Also, the vacuum to the fuel pressure regulator shouldn't come from the canister. It should have a constant vacuum directly from the intake. At an idle, intake vacuum is at its highest. As a result, the regulator diaphragm is drawn up reducing the fuel pressure. Under a load, the vacuum drops causing the diaphragm to lower and increase fuel pressure. If it isn't working properly due to a vacuum leak or no vacuum to the regulator, you are going to get too much fuel pressure all the time.

As far as fuel pump pressure, it should be between 35 and 40 psi with vacuum present at the regulator and at an idle.

Check that and let me know what you find.
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Tuesday, February 17th, 2015 AT 6:08 PM
Tiny
JMARLEY09
  • MEMBER
  • 5 POSTS
Well I noticed that the spot where the vacuum line connects to the intake manifold to the fuel pressure regulator is taking by a hose connecting to my blow off valve, take into consideration I put that my car is turbo charged. The men who did my tune were the last to even touch my vacuum lines.

Also my car will idle low at times. Like the idle will drop below 700 but will also go back up after driving for a minute or 2.
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Wednesday, February 18th, 2015 AT 8:27 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Is there an aftermarket turbo on the vehicle?
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Wednesday, February 18th, 2015 AT 7:39 PM
Tiny
JMARLEY09
  • MEMBER
  • 5 POSTS
Yes, their is a after market turbo on the car. The spot where the hose from the fuel pressure regulator goes into the intake manifold is taken by a hose running from the blow-off valve.
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Friday, February 20th, 2015 AT 3:58 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Okay. What do they have going to the regulator?
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Friday, February 20th, 2015 AT 9:24 AM
Tiny
JMARLEY09
  • MEMBER
  • 5 POSTS
Nothing. Its just the hose hangin down. When I got it after the tune it ran perfectly fine. I tried new spark plug wires and it ran the same.

I even disconnected the blow off valve from the intake and connected the regulator to the intake. It still ran the same. Back and forth from sputtering to normal.
Spark plugs were recently changed also n seem to show no signs of fouling.
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Friday, February 20th, 2015 AT 10:00 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Lets do this. Check fuel pump pressure to confirm it is within the manufacturer's specs.
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Sunday, February 22nd, 2015 AT 8:11 PM

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