Question about 1991 Mazda MX-6

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Is there a fuel cut switch or sensor on a 90 mx6 gt that cuts the fuel at higher boost levels than stock if so where can i find it on the car? i have the same problem when i hit 10 psi the engine stop,how i can fix that problem? the car have a fuel cut or someting like that?

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I don't think there is a fuel cut switch but there definitely is a fuel pressure regulator. the stock specs call for the system to make more like 30 psi, so if you are only getting 10 psi there is a problem. you might check for clogged fuel filters. if you mean that you are going 10 psi over stock then might be the fuel pressure regulator that's causing you to not be able to, maybe you can get one that lets you pass more fuel, that would be an aftermarket part. hope that helps

Posted on May 28, 2009


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I would like to know how to change ignition timing

How many pounds boost 5psi , 15? what?

what year, what engine, nobody can answer this , lacking hard facts.

forced induction is not that simple.

you need to control AFR under boost, and retard the timing.

that means knowing exactly what you have now ,EFI wise?. if it even is. Is itr a CARB engine?

read Greg Banish books sold on amazon first , then hack.

or you will fail, (melted pistions,bent rods)

they made lots of picks, some with CARBs. back when.

surely you know the year , the exact model and what engine is there.

that be like first , hacking the spark and fuel systems.

1972 to 2002.?

ippon is 88 to 2002

see here for all PU

which car, what year , what country.??????????

17 engines, even a diesel.

we are clueless to what you have.


Try 5psi , more will likely bend rods.

The first trick is to find out of your stock MAP sensor can do the boost you are using. if not that is FIRST.

IF the engine is MAF based, then same question.

a way to increase AFR, use a linear progressive fuel regulator.,and a fuel pump that can do max required fuel under full boost.

have a plan for spark retard.

have a plan for engine ping (knock /detonation) Use a aftermarket knock sensor. to do this automatically.

The best way is custom ECU.

2nd best or worse is piggy backs. (it\'s a pray thing)

The plan is to have a fail safe system that cuts spark , if engine knocks or fuel pressure goes low. for any reasons (a new fuel sensor added)

that the nut shell all covered in Banish books or Jeff Hartmans.

can your stock injectors do your unstated level of boost.?

the ippon page lists all these engines. a bunch !

2.2 L 115 hp (85 kW) I4

2.3 L 4ZD1 I4

2.6 L 4ZE1 I4

2.5 L 4JA1-T

2.8 L 4JB1-T td I4

3.0 L 4JH1-T

3.1 L 4JG2-T td I4

3.1 L LG6 V6

3.2 L DOHC V6

now to attempt and answer, not knowing what engine or ignition option

the ECU has what is called and Ignitor output.

what you need , at the minimum is to interceed this pin.

to the spark coil. (s)

and then delay that by X amount, under boost.

a piggy back does that

a new ECU does that (tables)

or a sold dedicated, spark delay box , just for boost. (any)

if you buy the ECU, new. the first will be, boost levels.

then caculations of required fuel at full boost

matching pump

and matching injectors.

then tune it from scratch.

that is the best way.

the other way is attempting to fool a stock ECU;.

good luck with THAT.

Apr 01, 2014 | Isuzu Pickup Cars & Trucks

1 Answer

Engine starts normally then cuts out after about 1 second. The time until it cuts out is exactly the same whether started with or without throttle and seems to be an electrical cut out. All warning lamps...

Limp Mode - These cars are designed to protect themselves from engine damage. If the engine boosts too much, or the engine does not get enough fuel it will go into a limp mode where boost is limited to protect the engine. It limits boost by controlling a solenoid on the wastegate line (N75), by closing the electronic throttle or by opening the DV valve. If you are experiencing a limp mode the best thing to do is get the car scanned for codes and to see what is wrong. Look at fuel trims for signs of running lean, and to look for MAF problems, or O2 sensor problems. To look for potential boost problems log Block 115 and you can see the specified Vs actual boost. If you exceed the specified then there is a good chance that you will go into this limp mode. Stock specified is a max of 14 psi for a 2002+ car.MAF - Mass Air Flow Meter - is used to measure the air going into the engine. It is located on the outlet of the airbox, and housed in a cylindrical tube. The ECU reads the MAF signal, and injects fuel in proportion to the airflow. There are a few different ways the MAF can fail. The MAF can get coated with oil, and will not read properly. This is common if it happens right after installing a CAI, or a K&N filter. It can be cleaned out with 99% isopropyl alcohol, or a quality electronics cleaner. Remove the sensor from the housing and clean the sensor element.
MAF sensors also go bad due to too much airflow. On a car with a larger turbo the airflow is so high that the MAF element will get burned out from the excess air flow. It is common to increase the size of the housing to prevent this (other modifications required).
To check for a BAD MAF the best way is with a VAG com. Block 002 show air mass from the sensor. At idle the air flow should be 2-4 grams/second. With a wide open throttle run to redline the reading should show up to 170 g/s on a chipped car. Look for jumpy readings in the MAF, which can indicate a problem. More details here:

if you suspect your MAF is bad, one way to test it is to unplug the MAF, often if the MAF is giving false readings and upsets the fueling. If you unplug it, the ECU will ignore the MAF and run off of baseline tables. Be careful, as a boost leak or a vacuum leak can be miss-diagnosed as a bad MAF, because they will throw off the readings on the MAF. (Air sneaks around the MAF).

Dec 23, 2010 | 1997 Audi A4

3 Answers

Where is the fuel relay located in Mazda mx6 1988?

On that one it actually called circuit opening relay under left side of dash in fuse relay box


Feb 08, 2010 | 1988 Mazda MX-6

1 Answer

Power loose

Make sure you have no boost leaks or vacume leaks. Any air leak is a killer bro. Try using ngk bpr73es it is one step colder plug that the stock,, that will help with the extra boost since these cars came stock with the actualality of 9psi and you might want to invest in a aftermarket fuel pressure regulator if you are going to be messing with the boost or use a fuel pressure regulator off of a 95 to 99 talon or eclipse

Aug 21, 2009 | 1994 Eagle Talon

2 Answers

Up my boost on 97 eagle talon

Hello, I wouldn't up the boost without supporting mods. The stock motor will take 18psi of boost, but you run the chance of over heating your internals, hitting fuel cut, leaning out your fuel mixture to much, and all sorts of other bad news.

Mar 22, 2009 | 1997 Eagle Talon

1 Answer

Bucks at high ecelerations

May be going into overboost and the sensor cuts off the fuel. Is the boost guage reading higher than normal? If so the waste gate diaphram may be bad.

Mar 08, 2009 | 1988 Audi 5000 CS

1 Answer

Will cut out at speed. And then starts again.

boost too high,theres a boost cut out that interupts the engine by cutting out split seconds to stop overboosting,is it stock or has there been mods done

Mar 07, 2009 | 1995 Subaru Impreza

2 Answers

Still cutting out

could be associated with ur turbo, "boost lag" have u turned up your boost latly?? the talon stock turbo is only good for 12-14 psi 14 max any higher and it sounds very bad on the motor

Jan 11, 2009 | 1991 Eagle Talon

1 Answer

Gtx mazda 323

Im not an expert by any means but it sounds like you are running out of fuel in the combustion chamber (or lean) and setting off the cars knock sensor. It seems to me there are several fuel pumps available on ebay eluding to the fact that they were a weak component. be extremely careful "pinging" is extremely BAD for the pistons and block. keep out of hard boost until you solve issue.

Nov 08, 2008 | 1989 Mazda 323

2 Answers

Plug gap settings

hi mate if you have changed the plugs they ussualy come with a preset gap but worth checking anyway i had a cosworth many moons ago with similar fault it came down to a fuel problem afiling that try a diagnostic machine hop it helps

Aug 16, 2008 | 1994 Subaru Impreza

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