Porsche 928: Why is My Car Hesitating?
A hesitating Porsche 928 can be a headache. You bought the car because it runs awesome, and not because it hesitates. Find out the potential causes in this article.
This article applies to the Porsche 928 (1978-1995).
If your Porsche 928 is hesitating and the issue is slowly getting worse, then you definitely want to get the issue resolved as soon as possible. A hesitating car can gradually get worse, and eventually leave you stranded. There are a few issues that can cause a problem like this. Some can be fixed by yourself, while others might require you to get some help. This article will explore those various reasons.
Step 1 – Check your spark plugs
The first thing to do would be to check your spark plugs and spark plug wires. If they are due for a change, replace them. If they look bad, replace them. The same goes for the spark plug wires. It is recommended to use OEM spark plug wires.
Pro Tip
Also, have the distributor checked along with the timing.
If your plugs and wires look good, try out the next step.
Step 2 – Check your fuel system
Check your fuel filter. If it seems a little clogged, replace or clean it. If your 928 has been sitting for a while, it is possible that your fuel has gone bad. You should have it replaced with good fuel. Check the fuel pressure. Porsche owners have said that running a fuel injector cleaner through their fuel system has helped their hesitating issues. Also, have the fuel injectors inspected.
Pro Tip
Gas can start to go bad anywhere from six to nine months, but it depends on the initial quality.
If your fuel system checks out, try the next step.
Step 3 – Check for vacuum leaks
Vacuum leaks can really have a negative effect on the smoothness of your Porsche's driving. Some vacuum leaks can be really small and hard to find. Regardless, it is important to make sure that you don't have any if you are experiencing hesitation while driving. You don't want to be throwing expensive parts at your Porsche in hopes of fixing the issue when it can be as simple as a vacuum leak.
If you don't find any vacuum leaks, try the next step.
Pro Tip
A Porsche 928 should have all its vacuum hoses replaced with age. The rubber will eventually dry and crack from the engine heat.
Step 4 – Check the catalytic converter's condition
Lastly, it's common to eventually get a clogged catalytic converter. When this problem occurs, hesitation will also occur. Inspect the condition of your catalytic converter, and replace it if needed. Many owners opt to completely remove it. This will increase performance and exhaust.
Pro Tip
If you remove your catalytic converter, be aware that you will have issues passing SMOG or similar emissions inspections.
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