Have popping out of exhaust and no performance. Car shakes bad and has no power.

I can disconnect one or all the injector wires on the passenger side with no change to the engine or idle. The only change I seem to notice is the popping will go away when the injectors are not connected (btw - if I unplug individual injectors on the drivers side big difference noticed)

Checked for vacuum leaks, spark and fuel pressure - everything perfect there. Have voltage and all the injectors are "tapping" away. Confirmed that plug wires were in the correct order and connected well.

Just seems like the entire passenger side of the engine is dead.

HELP!

 

Another quick note, it seems that the distributor has an unusual amount of up and down play at the rotor. Probably at least 1/2". Does this help?

 

You just answered your problem. You have one or more bad injectors on the passenger side and your distributor needs to be rebuilt/replaced.

 

I just installed the used 24# injectors that worked fine before installation (About 10K on them). What are the chances I installed 4 bad ones on the same side? Pretty slim if you ask me. As far as the distributor goes, what's the level of play allowed. Again, up and down play. Could the distributor be the whole problem?

 

... And the car ran great before installing the 24# injectors, intake and runners. Why would the distributor be acting up now. It's definately on TDC.

 

Uh, where did you set the spark advance to...TDC? You want ~8deg BTDC or whatever the specs call for, small number but a huge difference in my experience.

 

doesn't make a difference at this point. car runs the same regardless of where i adjust the timing. I've adjusted it to 6, 8, 10 - no difference at all.

Thanks

 

Gotcha. If the symptoms just started after installing new injectors...the injectors are suspect.

The crayon test might help. Take a crayon and smear a streak on each header primary (assuming you're running headers). Fire up the car, any cyl not firing won't melt the crayon wax. The ones that are firing will melt it pretty quickly, even with ceramic coated headers.

 

cool idea with the crayon, will try and let you know what happens. As far as the injectors being suspect. Truely the chances of me installing 4 bad ones on one side are really slim.

 

You removed the connector from each of the RH side injectors and it made no difference?
If that is the case then you have a "bank" out. The ECM divides the injector harness into left and right, it sounds like maybe the harness is bad, bad connection at the ECM or a bad driver in the ECM.

 

Please remember that all the injectors on that side are "ticking" as if they're pumping. Would you still think the bank is out? And yes, if I pull each injector clip off one at a time, all driver side drop the idle, all passenger side don't make a difference. Matter of fact, if I take all four from the passenger side off at the same time - engine idles exactly the same as if they were still connected.

 

Well if you are sure they are actuating then the only thing left is either a blocked fuel rail, or there is no ignition to the entire right bank or all RH plugs are fouled/bad.
I would think that if the injectors had fuel and no ignition you'd be smelling lots of raw gas from the exhaust

The "poping" noise might very well be the gas lighting off in the cat or elsewhere in the exhaust.

 

Theres only one driver in the ECM... if it was bad, all the injectors would be dead. Check your grounds at the back of the heads, its possible that one of the grounds broke loose during your swap.

 

I will check the ground. Could the "play" in the distributor cause this?

Thanks for all your attention and advice.

 

The shaft has 1/2 inch play up/down? Are you sure that you have the housing seated correctly? There should not be hardly any play,up/down. I'd pull the dist, give it a good looking over and reinstall it. cheers, Bob

 

then why are there 2 connections for the injectors to the ECM, A&B (left and right)?

 

Check your fuses, the fuel injectors have a common ground, but the hot side has 2 seperate fuses.

 

I'll double check the fuses and grounds. But I've confirmed by connecting the old fuses and used a stethescope they all were clicking. Also, as previously mentioned the popping in the exhaust only occurs when they are plugged in. That would make me believe that they were pumping gas, but not burning it.

 

It limits the amount of current going thru each terminal. By having two connections, each sees half the total current. Now I will qualify my statement, as the 749 does have two drivers in it. However, both are only used with the Turbo Sunbird as it uses 4 P/H injectors, 2 per driver. cheers, Bob

 

$5 at PepBoys buys you an injector test light, clip it into each injector connector and spin the engine over. Light flashes, your electrical system and ECM check out. No light, you got issues.