2001 Volvo S40 Car Troubles

VOLVOS402001

MEMBER
2001 VOLVO S40
4 CYL
2WD
AUTOMATIC
66,000 MILES

For now two main problems trouble me. They have been ongoing, even though I managed to fix the problem with my mechanics.

1. When my car decelerates ranging from 60-40 mph, or coming to a stop, the car jolts as if it went over a log. It's very surprising and annoying.

2. Sometimes when I put key into ignition, car won't start. It takes a couple tries.

5 Replies

JIS001

MECHANIC
3,411 POSTS

#2 problem what you need to do first thing in the morning is pull thevacuum hose off the fuel pressure regulator. If you see fuel then there is your problem. What happens is that the fuel pressure regulator leaks raw fuel into the intake causing a hard start especially when you let sit overnight. If no fuel is present then the second culprit will be the idle air control valve being stuck open. Usually you can just remove it and clean it out. Your first problem it is hard to figure out without actually drivng it and feeling out your complaint?

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Sunday, June 21st, 2009 AT 12:27 AM

VOLVOS402001

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3 POSTS

Thanks for your response. I recently replaced a fuel regulator and flushed out coolant system. Supposedly that was what needed to be done. Although the ignition firing is not a frequent problem, it has not totally disappear.

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Sunday, June 21st, 2009 AT 3:38 AM

JIS001

MECHANIC
3,411 POSTS

What happens when the car wont start? Will it crank over? Do you see any lights flashing on the dash?

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Monday, June 22nd, 2009 AT 1:57 AM

VOLVOS402001

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3 POSTS

I put the key in the ignition for the engine to start. The lights are lit but it doesn't start. I take the key out and put it back in. Then it starts. This happens randomly throughout the day. It doesn't matter if the engine is still warm or cool.

But I was hoping if there is anyway of diagnosing the first problem. To refresh, basically I am slowing down at a stop sign or a traffic light--usually slowing from 60-50 mph. As it reaches 40-30 mph, pushing the brake slowly at 200 feet, I feel a sudden abrupt jolt. This is done randomly throughout the day too, but mainly at night when the engine is cool. I updated the TCM software, but that did nothing.

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Monday, June 22nd, 2009 AT 3:36 AM

JIS001

MECHANIC
3,411 POSTS

Hard to say with out actually driving it to feel it but my guess would be that the transmission itself may be going bad or there is a bad solenoid and you are feelng the 3-2 shift very harsh. You can try a tranmission flush and maybe if a solenoid has some debri it will get it out? If you decide to do the flush make sure you use the proper fluid. Pull the dipstick and if it says special fluid required use Volvo synthetic oil.