Newbee to forum

[6-FITZ]

Hi I'm new to the forum. I've had my 93 SHO ATX since 97. I obviously like it as you can tell. Anyway it has 156K on the or. engine and I think I am starting to have problems w/ my injectors. I need to know what lb/hr. injectors come in the 93 3.2s'. Was thinking about using some ijectors out of a 3800 GM v6. They are 22 lb/hr, also have my hands on a set of 28 lb/hr injectors. Let me know if anyone has any info on this subject. Thanx!

 

[SHOTIME]

Far as I know, they are called 27#'s but only flow 23#'s

 

[sdpatt]

What makes you think the injectors are gving you problems? There is a great deal of diagnostics experience on this Forum. Let us share our knowledge with you. Please give us more information about the situation you are having. The reason I ask is because the injectors are very rarely a source of problems on the SHO. Low power? Hesitation? Misfiring? Let us help.

 

[6-FITZ]

This may get a bit lengthy but, the car has 156k on it. The car does everything else well exceot that little deal. The problem gets real bad the hotter it is outside. I've replaced the following things over the years which have not fixed the problem but has fixed others: fuel pump,power module, coil, 120k maintenance, fuel filter few times, tune-up few times, wires, coolant sens., intake has been off a couple of times for thorough cleaning, and egr valve. The only codes I have ever gotten off the car is lean o2 back bank, egr, fuel pump relay circuit, and temp. over limit. The car has had this problem every since I purchased it in 97 but here lately the problem happens a little more frequent. On occassion it gets bad enough to stall the car. If I give the car a few good raps at the thrt. it will come out of this episode and run normally. Other people have told me our injectors seldom have problems , but that don't mean an injector can't go bad. Keep in mind 156k mi. of temp. cycling will take its toll on the toughest component. By the way I'm not too shabby w/ the mechanicals of cars at all, just wanted to get other SHO owners' opinion. I appreciate everyones replies and look forward to more inputs.Thanx.

<small>[ February 28, 2002, 03:55 PM: Message edited by: 6-FITZ ]</small>

 

[twr]

Just a thought - check your fuel pressure at the rails - possibly a bad fuel pressure regulator.
Terry burn_out

 

[luigisho]

I must be missing something here. I saw everything you did but not the reason why. Please elaborate on the symptoms.

 

[6-FITZ]

Power module was replaced because of a intremittent stall-problem solved, coolant sensor repl. because of the coolant temp. exceeded code-prob. solved, fuel pump early when car was purchased because of the problem I was talking about in my earlier post-didn't solve problem. I hpe that answers all of your questions and helps you to try to help me luigisho.

 

[luigisho]

I've read all your posts and none of them state what symptoms you are working on to correct. I think one of them states "except this little problem" w/out really saying what it is. stalling? bucking? underpowered? problems in hot weather?...If all you're looking for is to replace fuel injectors try shoshop's used & flow tested set of 6.

 

[sdpatt]

As luigisho and I have been asking, we are still looking for the description of "the problem."

Scott

 

[6-FITZ]

Sorry fellas , the problem I am having is sometimes after I have driven the car for awhile and park it for like 15-20min. the car does'nt start very well. I'll crank the car over and it will fire up roughly. It will idle rough for a min. then finally smooth out and idle normally. Sometimes it will stall sometimes I have to bring the rpms. up to about 3000 grand before the car's idle will smooth out. The problem gets worse when the weather outside is hot. Other than that problem, my car runs well.

 

[91 Plus]

6-FITZ:
Sorry fellas , the problem I am having is sometimes after I have driven the car for awhile and park it for like 15-20min. the car does'nt start very well. I'll crank the car over and it will fire up roughly. It will idle rough for a min. then finally smooth out and idle normally. Sometimes it will stall sometimes I have to bring the rpms. up to about 3000 grand before the car's idle will smooth out. The problem gets worse when the weather outside is hot. Other than that problem, my car runs well.

My car has done the same thing a few times! If you dont give it some gas it will just stall out on you. One day everytime I started up the car it would sit there and almost stall for a minute.Then I just give it some gas and be all set!

 

[luigisho]

I could be wrong but it doesn't seem like injectors to me. I'm assuming you checked plugs and wires for moisture (water/oil) and the plug gap. For starters, I would try cleaning or replacing the IAB/IAC if the problem occurs while at idle. You can find the procedure on the shotimes faq. While you have the carb cleaner I would recommend cleaning the maf and act for good measure. This is cheap and relatively quick. Check back if this doesn't help.

 

[6-FITZ]

Thanx luigisho. I'm assuming when you say clean the maf w/ carb cleaner you mean to spray the inside of the maf down w/ the cleaner. Am I correct in my assumption? And for the rest of your suggestions I did a 120k on the engine 3 mos. ago which included new plugs and cleaning the entire intake system icluding tb and iac. The iac was replaced when I bought the car and the problem I am having now was there before I changed the iac. I will try cleaning the maf and perhaps replace the intake temp. sens. Thanx for your input.

 

[6-FITZ]

Hey luigisho what is an "act" for the SHO?

 

[luigisho]

Air Charge Temp. Sensor. I think you posted intake temp. sens. Same thing. The sensor at the bottom of the stock air intake box. Also is the flex pipe still leaking? It may change the performance characteristics and make finding the problem more difficult. Have you checked the fuel pressure at the rails? tried cleaning out the egr passage/replace egr? Last time you changed tps?

 

[6-FITZ]

Flex pipe still leaks but since it is after the cats and o2s I wouldn't think that woul affect the problem I'm having. As far as the egr and tps, the problem was there before I changed those 2 components when I 1st bought the car. I will clean the maf and change the act as you suggested if that doesn't fix the problem then I'm going to put some 22lb/hr. inj. in and see if that cures the problem. I will keep everyone concerned posted. Thanx again for all inputs.

 

[6-FITZ]

Changed the ACT as recommended and also relocated for some free ponies and the new sensor seemed to fix my intermittent rough idle problem in hot weather situations on start-up. Thank you all for your helpful inputs.