Q: Rough idle after timing chain install run ok after 2500 rpms

asked by on December 07, 2017

Replaced valve seals timing chain and intake manifold gasket....head gaskets as well start up the vehicle has shaking rough idle but clears up after 2500 rpm.. 3000 rpm is perfect. The test drive feels like decent low rpm is crap... also would like to know if I have a wire in the wrong spot do not have a diagram for coil to plug..No smoke I'm about to set it on fire and push it over a cliff no intake vacuum leaks.....idk what to do will a off timing chain allow it to idle rough and be perfect at 3000 rpm????runs spool smooth at exactly 3000 rpm, also will this idle clear up after being driven?? It seems to (almost) disappear after warm thanks Matt 9807299880

My car has 187000 miles.
My car has an automatic transmission.

You should check the big main vacuum line going from the PCV valve to the intake manifold. The connection at the manifold gets a hole in it and will cause problems with running at lower rpms.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Car starts but won't run.

If your engine starts but won't stay running (idling) the problem is most likely a faulty idle air control (IAC) motor. The IAC opens and closes to maintain engine idle, if this component goes out, the engine will keep stalling. A...

Jeep shuts off when driving

Hello. Although this sounds similar to the problem you are experiencing, the crank sensor does not seem to be the problem because a malfunction of the crank sensor can cause the truck to run for a brief moment before shutting...

Key on, no start and no dash lights. 1996 Ford Explorer

Hello. This is likely a loose terminal or corroded battery connection. Make sure the cables and terminals are clean. Also check the ground in the engine compartment. It sounds simple, but something like this can easily cut all power to...

Related articles

The Top 5 Selling Cars in Connecticut in 2012
Connecticut Connecticut offers plenty of rain and its fair share of snow during the winter months, which means drivers need vehicles that can handle these conditions. Top selling vehicles in previous years have included the Toyota Camry, Corolla and the...
The Top 10 Most Problematic Cars
All cars have issues, from grinding brakes to gasket leaks. The Ford Explorer's and Honda Civic's bad transmissions rank them as the most problematic.
A Buyer’s Guide to the 2012 Ford Escape Hybrid
Over Over the past few years, we’ve seen a major trend toward people choosing crossover utility vehicles (CUVs) over larger SUVs. The big motivator here, of course, is buying a more eco-friendly vehicle that will also save you a bundle...