305 tbi running bad and getting worse
#1
305 tbi running bad and getting worse
I replace the TPS, IAC, coolant temp sensor. It started with a mild stumble at under 2000 RPM's, and now it runs rough at start up, weak throttle response, and running rougher. I will not drive it till I find an answer, cause I'm afraid it will quit running all together. Any suggestions?
#2
Re: 305 tbi running bad and getting worse
Plug in a scan tool, read the data stream. You'll likely have your answer in fifteen minutes.
Until you locate a scan tool, you can do a cranking compression test, a cylinder-balance test, and perhaps a cylinder leakdown test.
Until you locate a scan tool, you can do a cranking compression test, a cylinder-balance test, and perhaps a cylinder leakdown test.
#3
Re: 305 tbi running bad and getting worse
I replaced the sensors I listed in my previous post, along with cap, rotor, and plugs. I could not pull codes. The tune up helped over all, but I still get a intermittent stumble between 1 and 2 thousand rpms. I'm at a loss.
#4
Re: 305 tbi running bad and getting worse
I said "read the data stream".
Oh, yeah. How about the other tests?
#6
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Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: 305 tbi running bad and getting worse
If the timing is correct, rupture in FPR diaphragm?
#7
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Car: 1989 Trans Am GTA
Engine: 5.7L 350 TPI (Deleted Cats)
Transmission: 700r4
Axle/Gears: Original 3.27
Re: 305 tbi running bad and getting worse
Sounds like injectors seizing up. Did you pull the air cleaner off while it was running and take a look at them? Try looking up the ohms that they should be properly running at and test them to see what they come back as.