Jordan Anderson

Ok just got 1989 firebird with 2.8 V6. The MAF sensor was trashed so I got a new one and a new IAt sensor . I also connected the exhaust tot he manifold. below I have a link of what it sounds like. It won't idle and second video is when you switch it into gear it dies. I think maybe it will need new injectors and I am trying to get EGR valve cleaned. Any help is much appreciated.

Jordan Anderson

I know the MAF isn't connected to intake but it is plugged into the wire harness.

OrangeBird

iTrader: (1)

You not in a place yet where you should be expecting it to idle ......

In your video , all that can be heard is the popping of the exhaust leak , that's gotta get fixed . You say the MAF isn't seeing the manifold's vacuum , Why haven't you plugged the hose in ? Has it had new plugs anytime recently ? And just for curiousity's sake , have you done a compression test to know that you've actually got 6 good cylinders ?

You must fix the obvious before you can begin to troubleshoot the obscure

Good Luck

Jordan Anderson

yes has newer plugs. MAF just isn't connected to intake with a boot but is still plugged into harness. thought I got the manifold tightened all the way to the exhaust. I have not done a compression test.

Jacques101

I agree with Orange Bird… as rough as that is running – I would also check and see if you're firing order is correct… has any work been done to the valves? Could also be a stuck or miss-adjusted valve rocker

Jordan Anderson

not as far as I can tell there hasn't been any work I guess taking apart the top of engine and replacing injectors is best course of action. Any pointers on videos for this? I have the repair manual but it doesn't go step by step. plus I haven't done a compression test before so I will google that and got from there. thanks guys I will update after weekend of trying to return this poor thing to the road!

OrangeBird

iTrader: (1)

Jordan , If I could give you one piece of advice it would be ;

DO NOT buy parts randomly to fix problems on your car , just because that same fix worked on someone elses !

You will waste considerable money replacing parts as a method of troubleshooting , when proper troubleshooting will point you to the right area to spend your money !

Sure , your injectors COULD be fouled up , it's a known failure point on these cars . So too is the TPS , IAC , O2 sensor , various temperature senders , and a whole host of others . A few simple tests , the compression test most notably but there are other checks too , will begin to pinpoint the trouble areas and have you spending on only what's bad and not replacing functional parts .

Also , don't forget my ;

"you can't troubleshoot the obscure till ya first fix the obvious"

That exhaust leak has to be your first priority , followed by compression test , check of manifold vacuum , fuel pressure test , and so on .

Six_Shooter

iTrader: (2)

You need to get the MAF connected to the engine before doing anything else. Without that actually measuring airflow fuel delivery will be off and will never run right.

As has already been said several times fix the known issues first.

jharrison5

If the MAF can't tell how much air is running past it, the O2 can't tell what's in the exhaust, and so on down the line your car will never idle properly.

Gfunkill

firing order and/or distributer got moved.
MAF isn't gonna make the car run that bad. Mine hasn't worked in years, and it screams.
IAC will cause it to die if it's not been setup correctly (I learned that the hard way)

What prompted the MAF changeout other than being "trashed"?

If it wasnt doing this before the MAF switch, then what else did you do during that time frame that could have been done wrong?

Jordan Anderson

MAF was tied to the spot by where the air box used to be and I looked inside MAF and sires and board were fried. Firing order is correct. I have not gotten the compression tool yet to try that next.