Engine stumbled in drive way. Why?

RAY59

MEMBER
1999 SATURN SL2
175 MILES

Car was running great my wife pulled into drive way the engine stumbled my that's what I was told, I went out started sure enough it did the same thing went into engine bay initially the same situation suddenly the problem corrected itself. What are some possibilities don't want to be stranded. The report was as she pulled up it ran fine when the brake was applied it stumbled.

5 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Check for vacuum leaks especially booster and hose. I use spray of either water or tbi cleaner when idle changes you found s leak. Also pull the hose off the booster and pull the plastic check valve out
see if it allows air to pass only one way by blowing and sucking on it. Air should pass only one direction replace it if not this way

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Monday, September 19th, 2011 AT 2:58 PM

RAY59

MEMBER
9 POSTS

Please explain the following "pull the hose off the booster and pull the plastic check valve out
see if it allows air to pass only one way by blowing and sucking on it." I understant I may be looking for a possible vacuum leak what is Booster? What check valve PCV? Thanks.

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Monday, September 19th, 2011 AT 3:45 PM

MERLIN2021

MECHANIC
17,250 POSTS

The piece the hose attaches to is the check valve and can be pulled out to test it.

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Wednesday, September 21st, 2011 AT 8:40 AM

RAY59

MEMBER
9 POSTS

Hey Guys here an update SL2 hesitation, the mechanic didnt find a vacuum leak but they cleaned the throttle body tech also said he could not clean iac, or map sensor. Here is my question the fuel filter is not scheduled to be changed for 25K will just change it now is there a way to test fuel pump without pulling the tank down?

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Saturday, September 24th, 2011 AT 12:53 AM

MERLIN2021