Follow up on the idle issue

[richardchen0530]

Hi guys, i'm back again, this two weeks really learned a lot abt my 94QThe car was idling funny, fluctuated and stable and everything will be fine This car is good but the injector really is a pain!This is what i did the past 2 weeksGot a Fuel pressure gauge and measured the fuel pressure, pretty much normal, so no issue abt a fuel leak anymoreWent for a BG injector flush, right after the flush, car ran smooth, no fluctuating anymore, very happyHowever, 1 week later, car start to fluctuate again, this time even worse, sometimes it just reaches 100 RPM during start, but never diesNo light was on til today, engine light came on today for like a min,no clue wuts going on, started again, went away.Not going to read code anymore since dealer charges around 100bux just to read, had them checked twice without any solutionPlanning to replace all the other injectors beside the 2 i have just doneAny sugesstions guys?

[Q45tech]

A totally dead injector [running on 7] won't drop rpm by much, the engine should stay running on 4 cylinders.

Have you checked MAF and CAS connectors for intermitents?

What do injectors read ohm wise at injector [corroded connectors?]

Ethanolized fuel or not?

[Yimu]

Thanks for the reply tech:) You really helped me a lot in the past with fuel pumps and stuffI ohmed the injectors before i replaced the previous 2out of 8, 3 were not not within the range of 10-14replaced the 2 ones that are above 20ohm(one is 45ohm)Left a 19ohm one in there coz didnt order enough injectors at that time.Dont think MAF or CAS is a issue because engine light were never there, had the dealer try to scan something but they didnt mention anything about MAF. They just said i should have replaced all injectors.Was wondering should there be a code for the MAF?thanx

[richardchen0530]

One more question, could it be the AAC thats causing this?i cleaned the AAC but didnt seem to help that much

[1990Q45'r]

Irregular idle 9 out of 10 times is the MAF or more likely the MAF connector. Try to wiggle MAF connector when engine starts to die. Clean connections and/ order replacement connector and install.

[richardchen0530]

I did wiggle the MAF connector and seems like nothing changed much.And i think i'm suppose to get some code on the MAF issue.Anyways, i 'll pay more attention on the MAF and try to find something outthanks for the advice

[maxnix]

No code for a bad MAF in OBD I.

[Q45tech]

I make it standard proceedure to wiggle MAF, CAS, coolant temp sensor, tps, and ignition module connectors as the first thing I do upon opening hood. Even with a brand new modified MAF connector! Then I check EGR by manually forcing diaphram up to stumble the engine.

Regardless of the symptoms or problem......preventative diagnosis.

[AlabamaDan]

I had a rough idle that turned out to be a hole in a hose.