Question about Porsche 944

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No petrol geting throuh injectors good spark and fuel to rail

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  • incarnuts May 20, 2009

    I removed the fuel rail and had the injectors reworked at a reputable porsche repair. I installed the fuel rail back on and the car will try to start when using starter fluid. Could it be the DEE unit? Car has not run in over 5 yrs prior to my purchase from original owner.

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Either your not getting power to your injectors, they could be plugged.... there is a diod you can buy at an auto parts store to test for power at the injectores or you may have to get the injectors cleaned or replaced

Posted on Jan 25, 2009

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Take spark plug out and they are completly dry!and all 6 got nice blue sparks! and open junction petrol rail before injector, their are strong spray out! so please explain what is cause of?


Hi Jodie, Your fuel system utilizes an electric fuel pump to presurize the fuel lines to deliver fuel from the tank to the injectors. Now is the spray out caused by you removing a piece to see if you have pump presure or is it an actual leak that must be repaired? Any loss in the system will cause the plugs to run lean. Good luck

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Renault laguna 1998 petrol fuel line


Before going into the fuel lines check for spark at the spark plugs. When there is no spark, the injectors won't squirt fuel into the cylinders but there will be pressure at the injector rail and the pump will work.

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98 dodge ram 1500 5.9 truck has been sitting for 2 years with a blown ****** got the ****** rebuilt and installed it back in the truck but wont start has spark and fuel at rail but injectors wont fire


98 so its a older vehicle ?? Well i know nothing about layout of this american vehicle but for its age check the fuel rail as on the end is a vacumn controlled valve so make sure its connected and the vacumn pipe isnt cracked or perished ,Anything else i have no idea sorry dont see these motors here in spain very often unless its on a imported camper van but these are normally all diesel ,have seen a 7.2 litre ford E350 petrol though but running on a gas conversion

Mar 09, 2013 | 1998 Dodge Ram 1500 4WD

1 Answer

2004 ford explorer will not start but turns over


For a no start , cranks over ok. be sure you have fuel pressure at the fuel rail first, before checking the injectors. There should be more that 40 psi at the rail... if not .. you might have a fuel pump problem. Even if you have fuel pressure at the fuel rail... the next thing I would check for,,, is spark !! Make sure you have spark at the spark plugs. The order would be... fuel pressure first and then spark , , then injector pulse. !! Then plugged exhaust.... then bad fuel then engine timing. The injectors have power to them all the time. The PCM controls the ground to the injectors. So you would have to monitor the ground side of the injectors. So checking injectors is kinda complicated. Hope this helps you. Good luck.

Mar 03, 2013 | 2004 Ford Explorer

1 Answer

I have a 1985 toyota pickup 4/4 that is not geting spark to injectors or any fuel to fuel rail how do i solve this?


That may be two different problems. Or not.
You may have a relay problem that feeds power to the pump and the injectors but I doubt it.
Usually the injectors get power from a relay or other source, and the computer provides ground to open them.
You'll probably need to get a wiring diagram from the library or buy a shop manual to check the circuits.

Jun 28, 2012 | Toyota Cars & Trucks

1 Answer

I have a Toyota Sienna 2000. There is a fuel leak but Toyota can't find where it is coming from. Smell is emenating from the engine. Any suggestions please.


A good shop will add a fluorescent dye to the gas.. then use a ultra violet light to find the leak.

If your shop did not do this.. find one that will.

Also a good mechanic will check for other possibilities that may cause the car to run extra rich when it shouldn't. On this car that would be unlikely.. regardless..

If the car had a tune up recently.. someone may have mistaken the fuel injectors for spark plugs..and either did not reinstall the injector properly..or ruined/pinced one of the o rings or rail base seals in the process. Sounds silly..but it has happened..

Or perhaps one of the o rings or seals is failing.

Regardless.. have that dye test..and someone inspect the fuel rail and injectors for proper seal.
You are right to be concerned..leaks only get worse.. petrol.. not good.

Best of luck!

Apr 19, 2011 | Toyota Supra Cars & Trucks

2 Answers

My 2001 Saturn, will start but not stay running. We have checked the fuel pump and all fluids. Did a compression check this morning, fuel injectors are not injecting fuel into fuel rail. Why is engine...


You said, 'fuel injectors are not injecting fuel into fuel rail' but it's my understanding that the fuel rail gasoline is supplied by the pump, and the fuel injectors just pulse to allow fuel to get to the cylinders. I would check out the fuel delivery problem further. Check for pressure in the fuel rail that is within specs.

If not, then the pump or fuel pressure regulator may be the problem. Check the fuse for the fuel pump. If good, then the pump may be bad in the tank.

Good luck on this.

Feb 05, 2011 | 2001 Saturn L-Series

2 Answers

My 2000 explorer was missing and i changed all the plugs and wires. It's still misfiring. I took it to a shop and had a diagnostics ran and it said #2 cylinder misfire. the plug's brand new. Could it be...


Make sure the oil level is not too high, since this can make oil come up the breather pipe and down the inlet, fouling sparklpugs with oil and causing a misfire - some engines foul one plug, some foul a few - this can cause just one plug to misfire and might be the cause of the problem - check the level on the dipstick.
Check the inlet manifold for leaks - any garage will do this - not difficult. and change the gasket if it is leaking...
Check the ignition module if it has separate parts for each plug, If it has separate coils for each plug then maybe one is failing. and producing a weak or absent spark on no2 (unlike and old style coil that run all the plugs). Take off the lead for plug no2 and put an old sparkplug on it (put the sparkplug against a grounded engine part to get a spark, start the engine and check if it firing strongly and regularly - a poor spark indicates ignition trouble.
Possible bad wiring /loose connection to injector no2. Check the connector going to the number 2 injector, it has a little pin like a big staple stuck in it, it's shiny and goes across the top, take out the pin by prizing it out with a screwdriver, hold it when it is a little way out with your fingers then prize it or pull it the rest of the way off, if you prize it all the way off without holding it it will spring away and you will never ever find it...

Possible clogged or dirty injector for number 2, --- have the injector tested, same place you got the code from --- if it is faulty then it needs replacing, but if the electronic side of the injector is fine then the mechanical side can also be worn out or dirty.
If the electronic side is broken then it needs replacing.
If the mechanical side is "worn out" then it needs replacing
If it is dirty, then it can be cleaned....
- see, a dirty injector tends to dribble, drip and make droplets of fuel that don't burn good and produce a misfire. - unlike a clean injector that makes a uniform spray mist - which burns great.
you "can" take the fuel rail off and pull out the injector and wash it in petrol VERY GENLTY. They are very delicate and are precisely made instruments - handle with care and get NO DIRT anywhere near them - The only thing they "like" is petrol - it will never do them any harm, you can bathe them in petrol.
The thing is - if it definitely IS a dirty injector you cant make it much worse by trying to clean it yourself if you have the ability - a good rinse in petrol and a gentle encounter with a soft cloth soaked in petrol to get it looking clean as possible might just bring it back to life.
they cost around £150 EACH or around $200
NOTE: When you take off the fuel rail (if you are experienced enough to know where and what this is) Petrol will LEAK out of it all over the engine bay if you are not prepared - so do it with a COLD engine, disconnect and !!!REMOVE!!! the battery and NO SMOKING - have some cloth tucked all round the fuel rail and have a few cloths handy to soak and mop up this petrol (about 200ml WILL come out, maybe double this) - if there is no battery and no heat and no source of ignition there can be no fire..
The fuel rail is secured by a few bolts along its length, undo each one a little at a time then once they are loose undo them fully and place on a clean cloth (get a cloth laid out first)
Then you put the cloths (mentioned earlier) round the injectors and some cloths underneath the injectors.
Then you slowly pull the rail away from the injectors, wiggle it a little, once it is so far off it will start to leak petrol - catch what you can with the cloths, pull it away a little at a time while dealing with the spilling fuel, trust me it will stop leaking once the rail is empty. once it is fully off you can then see the clean side of the injectors, Pull out injector no2 - only hold it by the body not the nozzle that was in the fuel rail, if you get any dirt or grit in the nozzle the injector can be ruined!
Put the injector onto a laid out, clean, lint-free cloth. get another clean lint free cloth and dip it in petrol, use this petrol soaked cloth to clean the "dirty" side of the injector - get it as clean as possible -(trying not to touch the clean end) there is a little pin sticking out of the "dirty end" of the injector, do not put any force on this pin, if it bends the injector will be no good, but saying that it is a machined steel pin and is reasonably tough, you can gently clean around it, but make sure the cloth is very wet with petrol and is COMPLETELY CLEAN and use as little force as possible to grit and dirt off the end of the pin and from around the hole the pin comes out of - then dip the dirty end of the injector into the petrol and swish it round to get it fully rinsed of any bits of stray grit or lint - NOTE: Once the fuel rail has stopped draining of its fuel and you have mopped up as much of the petrol as you can dont worry about little bits of fuel you cant reach - this job will take a good hour or two and it will all have evaporated by then.
This is a tricky job really and requires some delicate work and cleanliness when working with the components of the fuel system,.
Like I said dont do it if you're not sure,
AND - cleaning injectors like this is frowned upon in the business, many will tell you not to do it and only go to specialists (ultrasonic cleaning - expensive - may as well buy a new one) - but it's saved me money in the past and never damaged an injector.
If after all that it still misfires you can get the replacement injectors from the dealer or phone around your local motor shops and see if you can find a bargain - seen £150 at dealers and £79 at part shop... so its worth looking around. ------------------------------------- In order of whats probably wrong -
BAD HT COIL
BAD INJECTOR
LEAKING INLET MANIFOLD
VALVE OR PISTON WEAR OR DAMAGE
The ignition coil/module is easy to get hold of and no more than £100 $140? if you look around...
----------------------------------------------------
I tried my best... tell me how you get on..

Jan 20, 2010 | 1996 Ford Explorer

1 Answer

Car wont start sparks turns over gets petrol to fule rail but not


did you chk. to see if there is a fuse for injectors?

Jan 25, 2009 | 1993 Porsche 911

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