Question about Cars & Trucks

2 Answers

1991 corolla 1.6L 4AFE.fuel injected. rpms high,misfire,weak acceleration,&exhaust/vacuum leak. other suggestions?

New sparkplugs and fuel filter. injectors are in decent condition. thinking of replacing(need info on)distributor/plug wires.alternator and air intake hose will be replaced&fuel system flushed. Is there something I'm missing?? Also, whats the safest way to flush the fuel lines/tank (i want to completely clean it, like soap and water type cleaned)?

Posted by on

Ad

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Habit-Forming:

    Visited the website for 3 consecutive days.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 146 Answers

You may need new fuel filter. Seafoam works good to clean fuel system.or any reputable fuel sys cleaner. did you replace plugs or are you just thnking to? Trbl seems like stuck choke, if you have a carburated auto,ck that too.

Posted on May 20, 2017

Testimonial: "plugs are brand new, and its fuel injected. injectors have been checked (or so i was told) and seem to be fine. seems more like the engine is struggling to utilize gas more than not getting it. If that makes sense. and the filter was replaced about 6 months ago due to a fuel line leak and a mishap with diesel in the system. there is also a broken gasket in fuel pump, but i was told that wouldnt effect efficiency. (not sure if i should believe that, but ive went with it.) I'd like to stay away from cleaner fuels and id like to just pull the tank and wash it. lord only knows whats going on in the sludge puddle at the bottom of the tank.. lol"

  • 2 more comments 
  • Cassie Bunch
    Cassie Bunch May 20, 2017

    plugs are brand new, and its fuel injected. injectors have been checked (or so i was told) and seem to be fine. seems more like the engine is struggling to utilize gas more than not getting it. If that makes sense. and the filter was replaced about 6 months ago due to a fuel line leak and a mishap with diesel in the system. there is also a broken gasket in fuel pump, but i was told that wouldnt effect efficiency. (not sure if i should believe that, but ive went with it.) I'd like to stay away from cleaner fluids and id like to just pull the tank and wash it. lord only knows whats going on in the sludge puddle at the bottom of the tank.. lol

  • George Momberger
    George Momberger May 20, 2017

    you never mentioned diesel fuel in original question....need to flush entire sys, gas engines do not burn diesel. it cloggs up the filter too.

  • Cassie Bunch
    Cassie Bunch May 21, 2017

    so again, what do i do to COMPLETELY flush the system? and im not sure that was a vital piece of information, because as i said, the filter has already been replaced and injectors checked. I know what happens with diesel/gas and their differences, but that problem was solved over 6 months ago and the issues were going on before that happened.

  • Joe Stanton May 22, 2017

    A 1991 could use the fuel pump due to age. the fuel tank has to come out to replace it, clean the fuel tank then. Todays methanol fuel will absorb water from the atmosphere, It is the #1 destroyer of fuel pumps and injectors. A regular change of fuel filter and use of B&G additive is cheap insurance for a clean fuel system and continued performance

×

Ad
  • 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.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Cars & Trucks Master
  • 807 Answers

Your best bet on cleaning the fuel system is to add 1 can of B&G44K to the fuel. It is only available through dealership (11.00 a can at Toyota). It will condition your fuel pump and injectors. It is the best on the market and should not be substituted. Do this every 30,000 miles for continued performance.

Posted on May 20, 2017

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.
Good luck!

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

What is Pc171 Code


It's P0171 & P0174 not Pc 171 & Pc174 ! The engine computer has detected a lean condition ! That mean's it's not getting enough fuel or has a vacuum leak , bad O2 sensor ! fuel pump getting weak . fuel pressure regulator weak !
P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. Air Measurement System
  • MAF sensor (contaminated, damaged, malfunctioning, etc.)
Fuel System
  • Fuel pressure regulator (leaking, malfunctioning, etc.).
  • Fuel filter plugged, dirty.
  • Fuel pump (weak, check valve leaking, etc.).
  • Leaking/contaminated fuel injectors.
  • Low fuel pressure or running out of fuel.
  • EVAP canister purge valve leaking (when canister is "clean").
  • Fuel supply line restricted.
  • Fuel rail pressure sensor (incorrect reading).
Air Induction System
  • Air leaks after the MAF.
  • Vacuum Leaks.
  • PCV system (leak, valve stuck open, etc.)
  • Improperly seated engine oil dipstick.
Exhaust System
  • Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).
EGR System
  • EGR valve tube/gasket leak
  • EVR solenoid vacuum leak
Secondary Air Injection
  • Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
  • P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. See Possible Causes for DTC P0171. See Diagnostic Aides for DTC P0171
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.

Feb 12, 2015 | 2002 Ford Escape

1 Answer

I have a 95 camaro with a 3.8l. It had a #1 cylinder missfire code, I found out it had a bad fuel injuector so i replaced it. Now, it's showing a random misfire code. What could cause this change


An intake vacuum leak can cause this as well as other issues, read about it below.
Check Engine Light On, P0300 Random Misfire Code A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn't getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean

Jul 27, 2017 | 1995 Chevrolet Camaro

1 Answer

I have a 1993 Toyota Marino with a 4aFE engine. it's fuel consumption is very poor, 6.5km/liter. I have changed spark plugs, spark plugs reeds, fuel injectors and nothing changing. I checked the check...


Well you got half the tune up done, So replace the fuel filter and air filter. Gets some brake cleaner and clean inside the throttle body. check all the vacuum lines and make sure they are not broke or leaking. Also check the catalitic converter/s, These start clogging and will excessive fuel consumption.
Randy

Apr 21, 2011 | 1993 Toyota Corolla

1 Answer

Engine lopes whan accelerator is pushed,poor gas


WEAK FUEL PUMP OR STOP UP FUEL FILTER.RESTRICTED EXHAUST LIKE STOPPED UP MUFFLER OR CATALYTIC CONVERTER.LOW ENGINE COMPRESSION.VACUUM LEAKS IN THE INTAKE MANIFOLD.BAD PLUGS.WEAK SPARK OR IGNITION .

Jun 05, 2010 | Ford F-250 Cars & Trucks

1 Answer

I have a 4afe and i have no acceleration under 3000rpm but when goes over 3000 rpms the engine goes well. could help me ?


We have several Corollas 4afe and 7afe in our fleet - this is one of our favorite cars.

Your problem with acceleration could be due to any one of many reasons.

The simplest thing to start with is make sure that all the spark plug wires are secure and fit tightly on the distributor cap and the spark plugs.

Next, inspect the condition of the spark plugs and spark plug wires. If they look old, corroded, worn, they need replacement.

Check the distributor cap and the distributor rotor. If you see any signs of wear or corrosion, they need replacement.

If the fuel filter has not been replaced in a long while, it probably needs replacement.

Check the vacuum lines for leaks. With the engine running, listen closely for any hissing sound, and identify its source. If any vacuum hoses are cracked or loose, replace them. Also, replace the PCV valve (a $2 part at most auto parts stores).

Check the air filter and the air intake duct. Make sure air can flow freely into the manifold. Also check the intake manifold and the butterfly valve, make sure they are clean and the valve is functioning ok. If necessary, clean them with carburetor cleaning fluid.

All these factors affect the quality of spark and supply of fuel to the engine. In many cases, if you go through this list, your problem will be solved.

There could be other issues, for example problem with the ignition coil, throttle position sensor, idle air control, or mass air flow sensor. You can move on to check these as the next step after you check the items above.

If your problem is not solved, let me know and we can take it further.


Mar 24, 2010 | 1995 Toyota Corolla

1 Answer

PCV valve? IAC valve? Sparkplug wire? Throttle body? Vacuum hose?


the most common causes are plug wire, plug, vacuum leak at intake, fuel injector failure and last no/low cylinder compressio.

May 22, 2009 | 1998 Isuzu Rodeo

1 Answer

1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

Jan 30, 2009 | 1991 Toyota Camry

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

Related Topics:

50 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

78919 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

13604 Answers

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

Answer questions

Manuals & User Guides

Loading...