No full power

[gbmidyear66]

I would first do a quick check that your secondarys are opening, and that you secondary Vac system is holding vacuum (i.e. - pump does not run steady with key on, engine off).

You can check secondary actuator operation by "backprobing" - I believe it is pin C17 (check your FSM) on the ECM you want to connect to ground (I use a saftey pin to backprobe the signal).

With the ignition on, looking through the plenum with a flashlight at the secondary linkage - you should see the actuators open when you ground C17

If the above is all good - you are 90% there

[Brad Sewell]

My 90 will spin the tires in 2nd but it is certainly not all hell breaks loose spinning. But my Michelins are not the Goodyear smoke machines either. That's not a knock on the Goodyears, my tires just don't smoke that much.

Under hard acceleration you should be able to feel the secondaries open around 3000. Post up the Dyno results. I think I'm going to get mine on the treadmill next week.

[Route 66]

I'am having the same problem. I replaced the injectors. I put it back togather, had a few problems. I had a trouble code LTPWS 34 code. I first thought that was the problem. After reading the mechanics repair manual I no longer think that the LTPWS has anything to do with the secondary power system.! I also got a SES falt code 22 because I had noved the TPS. Someone here told me how to set it where it should be, I did that and then cleared the falt code 22. Now I no longer have any falt codes from the SES. But I can't get the secondary power to work. I don't think the secondary power was working before I replaced the injectors. I new the secondary injectors were bad so I assumed that was why I didn't have secondary power. I have looked under the plenum at the actuators they do not open. The vacuum pump is working properly, I repaired what leaks
I had in the vacuum lines. I also checked the actuators while I had the plenum off they work ok. I don't have a Tech I or anytype of scan tool. I am at a loss as to what to look for. Your help would be greatly appreciated as always.

Thanks ...E

[gbmidyear66]

Did you run the checks I suggested below?

If the secondary vac system holds vacuum, but the actuators don't activate when you ground the ECM pin, then my guess is you might have a bad secondary solenoid....

[tomtom72]

If I remember correctly....I may not be, but I do think that there is no DTC for a failed secondary vacuum solenoid. I know that a TECH1 or 1A can test it, but the aftermarket scanners & software can't do that test.

You may want to look at DTC61 as a diagnostic flow chart to see if the secondary solenoid is the issue.

Tom

[efnfast]

I'll look into things when I get back from the dyno. http://performance-dyno.com/dynocam.html

I'm not sure which way I want this to go. I'd rather not have anything busted, but wouldn't it be cool to find 125 extra hp I never knew I had.

I dyno at 8:30 this morning, I'll post up results when I get back.

Steve

[Paul Workman]

Originally Posted by efnfast

MY 90, has a full power display on the info panel. It doesn't seem to stop pulling at 5k. If the scan tool shows seconderies on, does that mean they are working?. Still going to dyno the car tomorrow. Guess that will tell all.

Oh, wow... Putting it on the dyno is ONE way of testing for secondary operation, but if it is just to verify their operation, I would rather use the money toward one of Marc's chips for secondaries delete, and just pull the bastards and never look back! I've yet to hear of anyone that has deleted them put them back, unless it was for NCRS or possibly emmissions requirements. AND, you might pick up a few extra ponies in the process, to boot!



I'm a BIG fan of deleting the bastards; pros outweigh the cons (for me). I'm just sayin...

P.

[efnfast]

Paul, I was scheduled for the dyno anyway. I figured it would give me a good baseline before I start doing mods. Dyno'd at 311 RWHP.

[mike100]

That result sounds like the engine is down 10-15 hp from stock and my best guess is partial restriction in the catalytic converters. If you get 200+ psi on all 8 cylinders with a compression test, I would tend to think your engine is still fine. That's easy to check on the LT5.

[efnfast]

Mikeahundred, headers, no cats, and exhaust go on as soon as he headers come back from being ceramic coated. I'm going to do a Marc chip and intake soon after. Then I'll dyno again.