Resolved 98 GST Eclipse idles crappy & stalls often

[Joshua T]

Okay so I go to press the brakes well doing under 25not and it's solid, You can stop but you have to lay on the brakes 28th both feet. Car also idles crappy & stalls often.

What could it be...

Before you ask I've done some newbie checks:

- Cleaned MAF
- ICA checks out
- BOV is good
- 2 leaks found with smoke test
(Throttle body seal, biss screw)
- Oil pressures good
- Compression test was 180psi across the board.
- Changed gas cap
- New valve cover & gasket
- No loss in brake fluid level
- EGR Valve works
Update edit:
- Fuel pressure is fine
- Cleaned injectors and tested them, they work properly
- New spark plugs & wires

Okay of I missed something let me know. Any ideas?? I'm stumped.

 

[gophishy10]

As far as the brakes, try bleeding them. Make sure to do all 4.
For the crappy idle and stalling, test the MAF to make sure it is working properly. Check out this thread on how to do that:
http://www.dsmtuners.com/threads/maf-or-mas-test-check.279488/#post151385215
If that is working properly and you have already done a boost leak test, when was the last time you did a tune up? Plugs and wires. You could also check your fuel pressure and run some injector cleaner.
Last guess would be ECU, but start with the smaller stuff.

 

[Dstarperformance01]

Is the brake pedal hard to push or is it spongie? If it's hard, check for vacuum leaks at the booster. Pull supply line off while engine is running to see if you have vacuum leak or if the check valve on the end of the hose that goes in booster is bad. Vacuum leaks at booster will cause hard pedal and poor idle. Is this a 1g or 2g?

 

[Joshua T]

As far as the brakes, try bleeding them.

I updated the post. Have a look at the list.

Is the brake pedal hard to push or is it spongie? If it's hard, check for vacuum leaks at the booster. Pull supply line off while engine is running to see if you have vacuum leak or if the check valve on the end of the hose that goes in booster is bad. Vacuum leaks at booster will cause hard pedal and poor idle. Is this a 1g or 2g?

The pedal is hard to press not spongy. I have to use both feet to stop. I checked for a vac leak on booster. Nothing? It has vac pressure on supply line.

Could the booster be leaking internally or something wrong inside?

 

[Dstarperformance01]

When you unplug supply hose put your finger over hose and see it it sucks your finger too it. If it does then plug it back in and spray brake cleaner (carb cleaner works better) all on booster and see if idle revs up. Also try it while you or someone else is pushing on pedal.

Sometimes they leak between booster and firewall

With the vacuum leaks at throttle body and BISS, spray brake/carb cleaner on it while running and see how high idle goes up. If it's a good amount then I would address those first.

You could have a bad enough leak that it's taking away vacuum from booster.

 

[Joshua T]

Alright I just spray with carb cleaner on biss & throttle body seals, the idle doesn't change at all. Sprayed everywhere hi could possible spray & no change in idle at all?!

 

[Dstarperformance01]

Okay. You can get (local parts house should have a rental one) a vacuum bleeder hand pump and test the booster or throw a booster at it. Me (a mechanic for over 16 years) would test it vs throwing parts at it but that's just me. You can do as you wish.

 

[oneslowwdsm]

Alright I just spray with carb cleaner on biss & throttle body seals, the idle doesn't change at all. Sprayed everywhere hi could possible spray & no change in idle at all?!

I would start by bleeding all 4 calipers and go from there. It's also possible your calipers are frozen if the car has sat for a long time. It's kind of rare for a brake booster to be bad on 2g's but is possible.

I didn't see if you did a boost leak test, either. That would be the second thing to do after you fix the brakes. Fix the brakes first, stop driving the car, that's dangerous.

 

[Dstarperformance01]

All four or even 2 frozen calipers while sitting? The odds of that happening are less than any brake booster going out.

 

[Joshua T]

Okay, I know it's been a while since my last update. I just wanted to take a second to thank everyone for there feedback. Finally took her to get looked at about a week ago, Since I am a delivery driver at Dominos & need her to run.

I found out that her timing was off 2 teeth. I have since put 884 miles without a problem.

Thanks again.