96 Eclipse Rs Non-turbo Vacuum problem.

donidavis · 08-21-2010, 05:27 PM

Hey guys im having problems with my eclipse. i put a new engine in and now its trowing codes. the ODB11 says that is a incorrect fuel combustion... fuel pressure regulator isnt getting vacuum to it or something. When i crank it it idles a lil below 1x then it picks up... then it starts to backfire really bad!!!. we got new plugs wires Coil... Somebody told me its not getting vacuum to the regulator.. So if anybody could help me out i would really appreciate it!! im young and trying to learn thats all!!

Thank guys

ned032002 · 08-21-2010, 07:15 PM

Welcome to AF.
If the n/t model is anything like the turbo model eclipses, then the vac source should be coming straight from the intake manifold. Check the fuel pressure regulator vac line and see what it connects to and see if there's any cracks in the vac line. Definitely check all your vac lines would be my 1st step.

donidavis · 08-21-2010, 08:43 PM

Ok i checked all of them and i took a fuel pressure check gauge and put it on the regulator to see if any vacuum is getting back there. but gas started coming out so idk what the pressure was back there! what would you try next?

Thank you for the help!

ned032002 · 08-21-2010, 09:31 PM

The vac line on the fpr had gas come out of it? Which part did you check here

http://www.dsmtuners.com/forums/420a...non-turbo.html

donidavis · 08-22-2010, 12:52 PM

i took the hose off of the regulator and put my vacuum gauge on the regulator. which is located right above the fuel filter. idk man im confused and dont know what else to do!

ned032002 · 08-22-2010, 02:51 PM

You put it on the vac source or on the fuel return part? I think you may have connected it to the fuel return because there shouldnt be any fuel coming out of the vac part. The vac source allows the fpr to hold more pressure, allowing more fuel during WOT pulls because the spring resistance will be stronger because of the vac.
The vac line on the fpr should go to the intake manifold, if its not connected to anything, then it won't work.

ned032002 · 08-22-2010, 02:55 PM

Whats the exact code you got?
http://www.2gnt.com/?d=PCM_Error_Codes

donidavis · 08-22-2010, 07:23 PM

ok i understand that. see the pic you sent of the fuel system... my fpr is above my fuel filter and all of that is located at the back of my car. and on my intake manifold there is only 2 vac lines conected and there is 3 ports for vac. mine kinda looks like tho one in the pic.

ned032002 · 08-22-2010, 09:32 PM

One of these 420a guys is going to have to chip in here. Usually theres a return and a vac line on the fpr regulator. Not sure on the 2g n/t models. Jason or Dave should have an answer for you.

david-b · 08-23-2010, 10:02 AM

You have a later model fuel system. Only a few early production 96s has the earlier (and better) fuel system with the filter in the bay and a return line. So I'm not familiar with the newer systems much.

Is there a vacuum line connected to the FPR?

donidavis · 08-23-2010, 12:15 PM

I checked it and i dont see where a vacuum line could be! i see the hose that runs from the top of the gas tank to the fpr, then a metal line that runs somewhere else!

david-b · 08-23-2010, 12:54 PM

Check on the fuel rail itself. On the passenger side, is there a metal piece (looks like the piece in that pic you posted) with a hose on it?

donidavis · 08-23-2010, 01:00 PM

Yea i did that also but on my fuel rail it just has 2 valve stems kinda like a tire valve. and the FPR is at the back of the car. I know about the FPR on the fuel rail because thats how it is on my 95 Eclipse.

SilvrEclipse · 08-24-2010, 10:20 AM

Ok if your fpr is at the rear of the car by the rear tire then there is NO VAC line going to the FPR. Your fuel system runs consistent pressure around 40-45psi. Put a fuel pressure gauge on the test port on the passenger side of the rail to check fuel pressure.

However I doubt your problem is related to the fuel pressure. The most common issue after rebuilds would be setting the timing wrong. Which would cause low vac and backfiring. I would do a simple compression test to see what numbers you get. If they are very low then the timing is set wrong.

donidavis · 08-24-2010, 10:38 PM

Ok but before i took the engine out of the parts car i have it ran fine... then all this started happening when i put it into my eclipse. ok after i check the compression would you re time it? and i thought the ECU controlled the timing? so i was told! thanx for the help!

POST REPLY TO THIS THREAD