maxnix
NICO Supporter
Offline
17465 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 4:02 PM 5/15/2008 |
|
Well, first off, read the timing chain guide article immediately! That may help you decide how to proceed.With so little maintenance history, it is difficult to guess how to proceed. But as fuel demands vary not just by rpm but also by load, I would obtain and post the results of a fuel pressure test. I also would post this in Infiniti Online Mechanic with a more complete maintenance history and ask the moderator to delete this post with a link to it in the new post. Welcome to NICO! 
Brian
1995 Q45 & Q45t & 2000 Q45
Discover the power of the button!
|
Haitian_King
Offline
2523 posts
1992 Infiniti Q45
Willingboro NJ
1-13-2007
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 3:40 AM 6/11/2008 |
|
| Quote, originally posted by odyyss » | I have a 92 Infiniti that has recently started acting like it cant breath. While driviing at speeds of atleast 40mph the car does ok until i come to a red light. when i stop the rpm's drop very low and the car dies, not every time I stop just most times. It will restart very easily but when I take off from the light it acts like it is either smothering or flooding and will not take off like it should. But if i get it up to 40 again it does fine. i have replaced the air filter and the fuel filter. What is weird is.... when its acting like its flooding if you put it in neutral and rev the engine it does just fine. That makes me think the problem isnt in the injectors, fuel pump. Does anyone have any ideas? Does the 92 have a MAF? Or should I try the Throttle positioner or the fuel pressure regulator? PLZ HELP GUYS
YOUR BROKE FEMALE INFINITI OWNER |
I'd like to think that it is the MAF. It may not even be dirty. Just a loose connector. http://forums.nicoclub.com/zerothread?id=82862
http://q45.org/maf.html I can't find the thread/picture that shows the loose MAF connector pin, but if you take a look at yours, you would be able to see what I was talking about. It could be possible that one of the pins has become "uncrimped" and isn't making solid contact. It's possible to just push down on the offending pin and "recrimp" it. Cleaning the pins and applying dielectric grease to them helps as well. Better conductivity (I think) as well as corrosion protection.
"Don’t buy a poorly maintained Q… It’ll be like falling in love with a high priced hooker! The sex will be great but you’ll be broke and up all night crying." - DrewQ45"I highly appreciate the wide range of knowledge Dennis contributes to the forum but you seem to be verging on the edge of Q45Tech worship. If he said air was bad you’d probably die from asphyxiation… Get a grip man!" - DrewQ45 "Those pics make my butt leak." - AZHitman "I pulled along side of one and stared at it. Then I saw the Hyundai badge and proceeded to vomit a little in my mouth." - Yours Truly
|
goody94q45
Q45 Undertaker
Offline
1822 posts
94Q45 90Q45
Orangevale CA
8-17-2005
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (Haitian_King) | 6:55 PM 6/11/2008 |
|
| Quote, originally posted by Haitian_King » | | ......I can't find the thread/picture that shows the loose MAF connector pin, but...... |
This one? 
Mike "Goody" Goodwin
94 Q45 160,000 miles ____________________ 90 Q45 117,000 miles
(The Beauty) ___________________________ (The Beast)
 
|
Haitian_King
Offline
2523 posts
1992 Infiniti Q45
Willingboro NJ
1-13-2007
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (goody94q45) | 7:55 PM 6/11/2008 |
|
You got it. I need to save that picture so I can find it easily. It didn't come up in a Google search earlier. 
|
odyyss
Offline
6 posts
1992 Infiniti Q45
memphis tn
5-14-2008
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (maxnix) | 6:03 AM 6/20/2008 |
|
| Quote, originally posted by odyyss » | I have a 92 Infiniti that has recently started acting like it cant breath. While driviing at speeds of atleast 40mph the car does ok until i come to a red light. when i stop the rpm's drop very low and the car dies, not every time I stop just most times. It will restart very easily but when I take off from the light it acts like it is either smothering or flooding and will not take off like it should. But if i get it up to 40 again it does fine. i have replaced the air filter and the fuel filter. What is weird is.... when its acting like its flooding if you put it in neutral and rev the engine it does just fine. That makes me think the problem isnt in the injectors, fuel pump. Does anyone have any ideas? Does the 92 have a MAF? Or should I try the Throttle positioner or the fuel pressure regulator? PLZ HELP GUYS
YOUR BROKE FEMALE INFINITI OWNER ......... |
Ok I have since taken the car to a mechanic here in town... He replaced the MAF, spark plugs, and charged me for a oil change that he didnt give me, go figure! He suggested that I replace the catalyic converters because he didnt feel any exhaust coming out of the back of the car. So for a temprerary fix we just simply cleaned the converters out, they were clogged. The car is still acting the exact same way as the original post. Today I unhooked the tps and drove the car and yes, still the same, no fix. Should i be looking somewhere else?
|
maxnix
NICO Supporter
Offline
17465 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 11:46 AM 6/20/2008 |
|
Well, definitely look for a technician familar with the VH45DE.Which catalyts? Pre-catalysts on the headers or main under the cars? Did they rattle? Why didn't he measeure your fuel pressure after the filter?
|
qship96
Offline
3078 posts
1996 Q45
Timonium,Md
11-24-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 12:07 PM 6/20/2008 |
|
| Quote, originally posted by odyyss » | Ok I have since taken the car to a mechanic here in town... He replaced the MAF, spark plugs, and charged me for a oil change that he didnt give me, go figure! He suggested that I replace the catalyic converters because he didnt feel any exhaust coming out of the back of the car. So for a temprerary fix we just simply cleaned the converters out, they were clogged. The car is still acting the exact same way as the original post. Today I unhooked the tps and drove the car and yes, still the same, no fix. Should i be looking somewhere else?
|
There is just soo much WRONG with that paragraph....no exhaust coming out of tailpipes...clogged converters....we cleaned them....they were dirty,etc
Get the car to a competant technician who will not play games with you or your Q
|
odyyss
Offline
6 posts
1992 Infiniti Q45
memphis tn
5-14-2008
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (maxnix) | 12:35 PM 6/20/2008 |
|
First let me say, i appreciate your interest in trying to help me figure this issue out. I took the car back to the mechanic this afternoon to inform him of what his business has done to my car. I forgot to mention that they somehow either shorted or wired my interior light to where it does not shut off on its own. They didnt notice that because they just simply reached up and turned the switch off but didnt notice the floor board light was staying on. That should have been a sign to them when i picked my car up and they had to JUMP it off! The main catalyic converters just past the headers are what we cleaned out. No they did not rattle but however they did stink quite often! The reason for not replacing is because here in Memphis the trusted company i know that does that wants roughly $3000 for the repair on the converters. I see no need in spending that much just yet when the car doesnt drive well in the first place. As far as the fuel pressure, i changed the filter and didnt think i needed to check the pressure. At this point, i still dont think that is it, maybe i am wrong. But with the converters empty, I can see that dark white blackish smoke coming out of the tailpipe. To me that tells me the car is getting plenty of fuel. I am always up for suggestions since I dont think this mechanic is gonna solve my problem, especially after me ringing his ear earlier. Once I get my moneys worth out of him i will be taking it to a foreign mechanic shop!
|
qship96
Offline
3078 posts
1996 Q45
Timonium,Md
11-24-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 12:57 PM 6/20/2008 |
|
How did you clean out the catalytic converters?
|
odyyss
Offline
6 posts
1992 Infiniti Q45
memphis tn
5-14-2008
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (qship96) | 1:04 PM 6/20/2008 |
|
We took the converters off and knocked the guts out of it, then replaced the shell!
|
Q45tech
Q45 Guru
Offline
12102 posts
1990 Q45 319,000 miles
Marietta , Georgia
4-30-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 3:11 PM 6/20/2008 |
|
Felony violation of Federal Clean Air ACT to tamper or remove cats or precats.
http://www.t3auto.com/
|
maxnix
NICO Supporter
Offline
17465 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (Q45tech) | 9:23 PM 6/20/2008 |
|
Well, smell alone is not sufficient to diagnose a failed converter. If they didn't rattle, they weren't blocked. Did you always burn Tier 1 Premium fuel? I just think you are engaged with the wrong shop. You must measure the fuel pressure to eliminate the FP and FPCU. Do these guys even have a FSM? Do you have the bible sized one that came with the car?
|
telcoman
Offline
1938 posts
2006 Infiniti G35 Sedan 6 MT. Mods unnecessary, Money goes to 401K plan.
East Brunswick NJ
7-8-2006
|
| « Re: 92 Infiniti Fuel/Air stutter????HELP (odyyss) | 4:33 AM 6/26/2008 |
|
| Quote, originally posted by odyyss » | Ok I have since taken the car to a mechanic here in town... He replaced the MAF, spark plugs, and charged me for a oil change that he didnt give me, go figure! He suggested that I replace the catalyic converters because he didnt feel any exhaust coming out of the back of the car. So for a temprerary fix we just simply cleaned the converters out, they were clogged. The car is still acting the exact same way as the original post. Today I unhooked the tps and drove the car and yes, still the same, no fix. Should i be looking somewhere else?
|
odyyss I feel your pain but I learned the hard way that sometimes you just have to suck up the $$$ the dealers charge. If you want to keep the vehicle, then one of those high priced $100k top technicians needs to troubleshoot your vehicle. Replacing parts without resolving generated trouble codes is the wrong way to go. Fuel pump and a possible fuel filter in the tank are possibilities? With a vehicle that old you should have a hard copy of FSM to refer to. Just my $.02 Good luck Telcoman 
 2006 G35 6 Speed Manual Premium Package A Factory Sirius Radio 69.7k miles, original brakes. No mods required, I love her the way she came. Mod money goes to 401K. Regular 87 Octane, all the time. Last fillup 24.91 MPG @ $2.99 gal.
|
| |
