Timeormoney New Reader
March 4, 2010 8:28 a.m.

So I cooked the 325is motor in my 87 e30, swapped in a spare and now I don't have a working tach, plus the motor is acting like it can't advance the spark. A few more mystery details: 1. I swapped the instrument cluster at the same time, so not sure if my tach is dead in the cluster 2. In a fit of stupidity and rage, I pulled the old head off the blown motor (with intake and exhaust manifold attaches) and chucked it to the recycler, with the BRAND NEW spark plug wires on it. So the current motor is running some very old wires, and the tach signal wire is a totally different color, so it COULD be a replacement or who knows. 3. New spark plug wires are $$$$, so I wanna make sure they are the issue before I buy a new set.

Soooo, how do I check this out? This would appear to be the rarest damn e30 problem ever since all my usual web sources have nothing listed, and even google failed me.

stuart in mn SuperDork
March 4, 2010 8:39 a.m.

Since you swapped in a different cluster I would imagine that either the tach in the new cluster is bad, or you missed a connector on the back side. Also, if the batteries in the service indicator board on the back of the cluster are bad the speedo/tach may or may not work correctly.

Timeormoney New Reader
March 4, 2010 8:41 a.m.

In reply to stuart in mn:

Checked Connectors, three times, all look good. I think it is probably the battery. If I don't have a working tach in the cluster, will that keep the ecu from controlling the spark?

March 4, 2010 8:46 a.m.

Since you have no advance I will also assume the ECU is not getting a good signal - since it runs we know its not the crank position so... check your lead from the spark plug wire back to the harness.

carzan Reader
March 4, 2010 9:55 a.m.

Are you using the same distributor? Also, you might as well go ahead and get some new wires. If they aren't causing this particular issue, they''ll cause another.

Timeormoney New Reader
March 4, 2010 12:15 p.m.

will check the connector for the signal next.

You'll need to log in to post.

Also on Grassroots Motorsports

Modern Day Track Junkie

1 day ago in Articles

Christina Lam went from the sidelines to full-on track enthusiast in 8 simple steps.

How Ben_Modified Wows the Crowd: 1 Part Imagination, 2 Parts Fabrication

1 day ago in News

Ben_Modified's build combines some of our favorite things.

2017 Audi A8 L

2 days ago in New Car Reviews

When it comes to luxury sedans, Audis are usually front-runners. The A8 L is the biggest and maybe most comfortable ...

Slight Project Pause for Our BMW M3

2 days ago in Project Cars

Few things slow down our project car progress more effectively than a broken arm.

Grassroots Motorsports Experience Ticket Renewals Have Been Sent

3 days ago in News

Check your inbox for our Grassroots Motorsports Experience renewals.

First Drive: Turbo ND MX-5

3 days ago in News

We hit the track with Flyin' Miata's latest power adder.

Project Turbo Miata: Fire Fighting

3 days ago in Project Cars

We transfer the fire system to our new Miata.

Vintage Views: GMC Syclone and Typhoon

4 days ago in Articles

All-wheel drive, turbo power and a Q-ship’s stealth.

Classic Motorsports Mitty Presented by Hagerty Celebrates Porsche

5 days ago in News

Gearhead heaven? We think it looks something like this.

Meet the Rebels Who Started the Cannonball Run

5 days ago in News

Relive those desperado days through movie excerpts, and hear the real facts and wild stories from the legends themselves.

This Weekend at the Mitty: The Ultimate Auto Festival

1 week ago in News

Gates open this Friday for the Classic Motorsports Mitty at Road Atlanta.

ND Miata Turbo Kits Now Available!

1 week ago in News

Add 70 horsepower and 70 ft.-lbs!

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
RyeaHRekVrAZcfgfhEDjOFwACmK6m5tp