Kandle's rx7

ok we found out that we are not getting gas all the way through the engine. as long as we keep sprayin starter fluid or carburater cleaner into the manifold, it will keep turning over. but when we stop spraying, the car goes rite bak to tryin to start again. the injectors are not clogged. they are brand new stock injectors. so that means they dont have to be timed. that cancels that out. we are getting fuel to the motor, its just not goin through it


i have a 91 N/A stock. i bought this car from a friend down the street a while bak. ive been doing my best to replace needed parts. i have replaced fuel injectors, fuel pump, fuel filter, battery, battery terminals, starter, fuel lines, etc.

the car will just keep tryin to start when i turn the key. somethin is keeping it from fully turning over. every now and then it halfway turns over but it just quits tryin immediately. ive got plenty of power. just give some ideas or somethin

the starter is turning the engine.
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Kandle's rx7

somebody please give me some idea. any help would be greatly appreciated

Eple

I can hear compression in the video, but out of curiosity have you actually done a compression check?

Are the injectors actually firing?

Valkyrie

WTF, Dragonforce in the back ground?

Something sounds really strange about that cranking.

...like you haven't got any spark plugs in the engine or something... and the high pitched noise.

Check your fuel pump first... jumper the fuel pump wire and listen to see if it's running. If it's running, pull off the fuel hose and see if you're actually getting fuel. It might be as simple as an unplugged fuel pump.

polito Racing

iTrader: (1)

yeah i cant hear any compression either.

Kandle's rx7

ive been getting a lot about my injectors from a lot of ppl. is there neway i can check them and see if they r firing?

i know im getting compression. ive been told by many ppl i am getting it. thanks to the crappy camera, u cant really here the engine. all u r hearing is that high pitch whiny noise which is the new starter. we tested the spark plugs and everything. we r getting spark all the way up through the spark plugs and i cant really go ne farther with that.

yea we had to replace my fuel pump already. we checked for fuel and we are getting fuel up there.

i was told i need combustion. any ideas on that?

Gremlin

Sounds a lot like my 91 NA as well. Best of luck to you as mine is sitting in front of my house.

Valkyrie

Air + Fuel + Compression + Ignition = Combustion

You are missing one of these things.

Or, you're getting WAY too much fuel or some other liquid in the engine that's drowning up the spark. But that's not very likely if you have brand new injectors (waste of money when you could have just got them cleaned and tested for $100, and have them coming out looking new and performing better than new).

InsomniacFC

iTrader: (4)

Mechanics stethoscope will help you hear if your injectors are firing.
http://www2.northerntool.com/product-1/385487.htm

They're usually that price at bargain tool stores like harbor freight as well. Listen for pulses at the injectors and if you hear nothing well.....

When you changed the injectors did you make sure all the grounds on the harness were hooked back up? I had the same issue when I put my emissions back on and put back the original harness. I forgot to ground it and I got fuel, spark and air, it was just not firing the injectors. Hence the motor not turning over. Check your grounds and make sure they are ok.

Kandle's rx7

are there ne parts on the wiring harness that need to be grounded? i think ill take the manifold off and check to see if i did it rite. wut happened to this car is me and a friend pitched in money for it. it ran just fine when we got it. then my friend tries to be smart and get the engine port and polished by some guy he randomly knows for free. while i was at a baseball game, my friend and his friend ripped the engine all the way down to the block, he stopped at the wiring harness. apparently it gets too dark to go on so he says he will come bak next weekend and finish the car. wellllll.... we waited. didnt come the upcoming weekend. we waited for about a month until i got pissed off so much (i didnt no crap about cars at the time) i just went outside and started putting the engine bak together piece by piece. i had to keep taking the harness and manifold off over and over again until i got it rite (or so i think). as soon as i get it put together, i try cranking it. it actually tried. i was proud. i kept tryin over and over again. and eventually i finally learn stuff little by little by finding out starters dont last forever. i go to the junkyard to get a cheep starter that still works. i get one for 25 dollars. it didnt fit the car by 4 milimeters. O M G. i finally order a brand new one. works just fine. then we tested the fuel pump. it was dead. the filter was clogged along with it. got new ones. they work. this is how far ive gone. (for neone that thinks that i dont look for my problems all over the place, beleive me, i do look after all ive done for this car

InsomniacFC

iTrader: (4)

You can port and polish the manifolds or throttle body while the motor is still in the car, but to port the motor you have to take it out. Search for street port, bridge port, J-port, or peripheral port pic's and you'll see what I mean.

Anyways, you might not have to take the UIM off to check for the grounds on the harness. I got lucky and knew right where I forgot to hook mine up. On mine it was right by the clutch slave on the rear housing. The was a nickle sized ring lug coming off of the harness that was previously attached. I'm not sure if the S5's have a ground in the same place so maybe someone will chime in and help out, or tell me i'm wrong, in which case i'm not really sure. Worse comes to worse, take off the UIM again and check your grounds.

hanman

You have no compression. That is EXACTLY what a rotary sounds like with no compression. Believe me I know.
What I would do, is pull the top end off. The TB and the UIM. Pour a little MMO, ATF, engine oil, or whatever your preference is to use. Then pull the engine over by hand and see if you can build some compression.

You say that you replaced the injectors. Did you replace with new? Or did you buy some used ones from someone?

hanman

BTW, don't freak because you have no compression. I think from the sound of it, that you have severely flooded the engine.

Kandle's rx7

ok i think ill try deflooding again. but, just to make sure, shouldnt there be white smoke coming from the downpipe (thats all i have on exhaust) when ur burning off the fuel?.

Kandle's rx7

u say to pull the engine over by hand. wut exactly do u mean.

i have two new injectors (primary) and two older ones (secondary

Valkyrie

Pull the plugs, turn over the engine (try to start it), and see if it blows out a bunch of fuel, oil, coolant, etc...

Then get a compression gauge and find out whether you've got good compression numbers.

hanman

Pull the leading (bottom) plugs. Get a long piece of vinyl tubing and a pump oiler. Pump some MMO or engine oil in to each rotor as you are pulling the engine over by hand. Just grab a hold of the fan belt and pull. You need to get a little oil on each face of each rotor. Put the plugs back in and see if it will start.

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